The Hyundai Aero City is prone to engine overheating issues, particularly in earlier model years. Symptoms often include high temperature gauge readings, steam or coolant leaks, and unusual engine noises. Common causes of overheating are faulty thermostats, coolant leaks, and radiator blockages. Inadequate coolant levels also exacerbate the problem. Owners should regularly inspect the cooling system and address any signs of wear or leaks. If overheating occurs, it is crucial to stop driving immediately to prevent further damage.
Common Symptoms of Engine Overheating
Engine overheating can be a serious issue that can cause significant damage to your vehicle’s engine.
If you notice any of the following symptoms, it’s essential to take immediate action to prevent further damage.
Temperature Gauge Reading High
A high temperature gauge reading is a clear indicator of engine overheating.
If the gauge consistently approaches or enters the red zone, pull over and investigate the issue immediately.
Other Common Symptoms
- Steam from the engine compartment, indicating a coolant leak or malfunctioning cooling system
- Unusual engine noises, such as knocking, pinging, or hissing, due to metal components expanding or contracting due to heat
- Loss of power or performance while driving, as the engine may go into “limp mode” to protect itself
- Warning lights on the dashboard, including temperature warning lights or check engine lights
- Coolant leaks or low levels, which can lead to insufficient cooling and engine overheating
Remember, ignoring these symptoms can lead to severe engine damage.
If you experience any of these issues, pull over safely and turn off the engine to prevent further damage.
Causes of Engine Overheating
| Category | Cause | Frequency | Severity |
|---|---|---|---|
| Coolant System | Low Coolant Levels | Common | High |
| Coolant System | Coolant Leaks | Common | High |
| Cooling System | Faulty Thermostat | Moderate | High |
| Cooling System | Blocked Radiator | Moderate | High |
| Engine Components | Worn Water Pump | Moderate | High |
| Engine Components | Faulty Head Gasket | Low | Critical |
| Fuel System | Rich Fuel Mixture | Low | Moderate |
| Engine Components | Overworked Engine | Moderate | Moderate |
| Electrical System | Malfunctioning Cooling Fan | Common | High |
| Miscellaneous | Ambient Temperature | Common | Moderate |
Explanation of Causes
- Low Coolant Levels: When the coolant levels in the engine are low, it reduces the engine’s ability to dissipate heat. This can lead to overheating, especially during heavy usage or in hot weather conditions.
- Coolant Leaks: Leaks in the coolant system can result in a loss of coolant, leading to insufficient cooling. If coolant leaks are not addressed, the engine can quickly overheat.
- Faulty Thermostat: The thermostat regulates the flow of coolant to maintain the engine’s optimal operating temperature. If it fails to open or close properly, it can restrict coolant flow, leading to overheating.
- Blocked Radiator: A blocked radiator prevents coolant from circulating effectively. Debris, corrosion, or sediment buildup can obstruct the flow of coolant, causing the engine to overheat.
- Worn Water Pump: The water pump is responsible for circulating coolant throughout the engine. If the pump is worn out or malfunctioning, it can lead to inadequate coolant flow and overheating.
- Faulty Head Gasket: A blown head gasket can allow coolant to leak into the engine cylinders or exhaust system, leading to a loss of coolant and increased engine temperature, which can result in severe damage.
- Rich Fuel Mixture: An excessively rich fuel mixture can cause incomplete combustion, leading to increased engine temperatures. This can occur due to faulty fuel injectors or a malfunctioning air intake system.
- Overworked Engine: Consistently pushing the engine beyond its limits, such as towing heavy loads or driving in extreme conditions, can cause it to overheat due to excessive strain and heat generation.
- Malfunctioning Cooling Fan: The cooling fan helps regulate the engine temperature by drawing air through the radiator. If the fan fails to operate correctly, it can lead to insufficient cooling and overheating.
- Ambient Temperature: High ambient temperatures can increase the engine’s operating temperature, especially if the cooling system is not functioning optimally, leading to potential overheating issues.
Coolant System Issues in Hyundai Aero City
Low coolant levels are a common cause of engine overheating. Coolant, a mixture of water and antifreeze, circulates through the engine to absorb heat.
If the level drops below the recommended level, the engine won’t receive adequate cooling, leading to overheating. Regularly check the coolant reservoir and top it up as necessary.
Other common causes of coolant system issues include:
- Coolant leaks: Leaks can occur in hoses, the radiator, water pump, or engine. Signs of a leak include puddles of coolant under the vehicle and a sweet smell from the engine compartment.
- Faulty radiator: A clogged, damaged, or corroded radiator can impede coolant flow, leading to overheating.
Regular maintenance, including flushing the radiator and checking for blockages, can help prevent these issues.
* Malfunctioning water pump: The water pump circulates coolant throughout the engine and radiator. Failure or inefficient operation can lead to hot spots and overheating.
Signs of a malfunctioning water pump include a whining noise, leaks around the water pump area, or a high temperature gauge reading.
* Thermostat problems: A stuck or faulty thermostat can cause the engine to overheat or not reach optimal operating temperature.
Symptoms include fluctuating temperature readings or an engine that overheats quickly after starting.
Addressing coolant system issues is crucial for the longevity and performance of the Hyundai Aero City engine.
Regular inspections, timely maintenance, and being alert to signs of coolant problems can help prevent overheating and avoid costly repairs.
Electrical and Mechanical Problems
Electrical and mechanical issues can cause engine overheating in Hyundai Aero City. Understanding these causes can help diagnose and resolve the problem effectively.
Failed Radiator Fan
The radiator fan is crucial for maintaining optimal engine temperatures. If it fails, the engine may not be adequately cooled.
Symptoms include:
- Overheating engine, especially during idling or slow speeds
- Unusual noises coming from the fan area
- Warning lights on the dashboard indicating an overheating condition
To diagnose, check if the fan is spinning when the engine reaches operating temperature. If not, it could be due to a faulty motor, wiring issues, or a malfunctioning relay.
Damaged Serpentine Belt
The serpentine belt drives various engine components, including the water pump. If damaged or worn out, it may slip or break, leading to insufficient coolant circulation and engine overheating.
Signs include:
- Squeaking or squealing noises from the engine compartment
- Visual signs of wear, such as cracks or fraying
- Warning lights indicating a problem with engine performance
Regular inspection and timely replacement can prevent overheating issues related to this component.
Faulty Temperature Sensors
Temperature sensors monitor the engine’s temperature and send information to the vehicle’s computer system. If faulty, the engine may overheat due to improper cooling system management.
A faulty temperature sensor may lead to:
- Incorrect temperature readings on the dashboard
- The engine cooling fan not activating when necessary
- Erratic behavior of the engine, such as stalling or reduced performance
Testing and replacing temperature sensors can ensure the engine’s cooling system operates correctly and prevents overheating.
Engine-Related Issues
Engine overheating in the Hyundai Aero City can be caused by several factors.
Head gasket failure is a common issue.
The head gasket sits between the engine block and cylinder head, sealing the internal combustion process.
If it fails, compression is lost, and coolant can leak into the combustion chamber or oil passages.
This leads to insufficient coolant circulation and the risk of coolant mixing with engine oil, causing engine damage.
Signs of head gasket failure include white smoke from the exhaust, engine misfires, or a milky substance on the oil dipstick.
Low engine oil levels or degraded oil can also lead to overheating.
Engine oil lubricates engine components and dissipates heat.
If the oil is contaminated with dirt, metal shavings, or coolant, it loses its effectiveness, causing inadequate lubrication and heat dissipation.
Regular oil changes and monitoring oil levels can prevent these issues.
Clogged radiator or heater core is another cause.
The radiator and heater core rely on coolant circulation to dissipate heat and heat the cabin.
Debris, rust, and mineral deposits can accumulate, causing clogs that restrict coolant flow.
Symptoms include fluctuating temperature gauges, poor cabin heating, or visible coolant leaks.
Regular maintenance, including checking coolant levels, inspecting the head gasket, and flushing the radiator, can help prevent overheating and prolong the engine’s lifespan.
External Factors
External Factors Causing Engine Overheating in Hyundai Aero City
Engine overheating can be caused by external factors beyond mechanical issues.
Understanding these factors is crucial to prevent engine damage and ensure vehicle longevity.
Extreme Weather Conditions
High ambient temperatures can exacerbate engine overheating, while extremely cold weather can lead to thickening of engine oil, reducing lubrication and increasing friction.
Using the appropriate coolant and engine oil for the climate can mitigate these issues.
Towing Beyond Capacity
Towing beyond the specified capacity can strain the engine and transmission, leading to heat build-up.
Adhering to the manufacturer’s towing guidelines is essential to maintain optimal engine health.
Prolonged Idling
Prolonged idling can contribute to engine overheating, as the engine generates heat without airflow from driving.
Regularly turning off the engine during long waits can help mitigate this risk.
These external factors can significantly impact engine performance and temperature regulation.
Model Year Specifics
Overheating issues in the Hyundai Aero City have been a concern, particularly in earlier model years. Severity levels vary by model year, with High, Medium, and Low ratings indicating the likelihood of overheating.
Model Year Severity Levels:
| Model Year | Severity |
|---|---|
| 2001 | High |
| 2002 | Medium |
| 2003 | High |
| 2004 | Medium |
| 2005 | Low |
| 2006 | Low |
| 2007 | Medium |
| 2008 | High |
| 2009 | Medium |
| 2010 | Low |
| 2011 | Low |
| 2012 | Low |
| 2013 | Medium |
| 2014 | Low |
| 2015 | Low |
| 2016 | Medium |
| 2017 | Low |
| 2018 | Low |
| 2019 | Medium |
| 2020 | Low |
| 2021 | Low |
| 2022 | Medium |
| 2023 | Low |
Improvements in Newer Models:
Hyundai implemented various improvements to the engine cooling systems in later model years, especially from 2015 onwards. These enhancements included better coolant flow dynamics and upgraded radiator designs, significantly reducing the likelihood of overheating. Advanced engine management systems also allow for better monitoring of engine temperatures, further mitigating overheating risks.
Year-Specific Recalls or Technical Service Bulletins:
Some model years experienced recalls or technical service bulletins (TSBs) addressing overheating issues. For example, the 2001 and 2003 models had significant recalls due to defective cooling fans that could fail, leading to overheating. The 2008 model year faced a TSB instructing dealers to modify the thermostat and improve the cooling system to prevent overheating issues.
Diagnosing Overheating Problems
Overheating can cause serious engine damage if left unchecked. Follow these steps to diagnose and address the issue safely and effectively.
The temperature gauge should stay between the “C” (cold) and “H” (hot) marks.
If the needle approaches the “H” or enters the red zone, it indicates overheating. Always check the gauge when the engine is running at operating temperature.
Don’t touch or open the hood immediately after a drive, as the engine and components can be very hot.
Step 1: Check the Temperature Gauge
Step 2: Inspect for Visible Leaks
Check under the vehicle for puddles or drips, particularly below the engine and radiator.
Inspect hoses and connections leading to the radiator and engine for signs of coolant leaking.
Look for bright green, orange, or pink fluid, cracks or bulges in hoses, and signs of steam.
Step 3: Check Coolant Levels
Wait for the engine to cool down completely before opening the coolant reservoir or radiator cap.
Locate the coolant reservoir, usually a translucent tank marked with minimum and maximum levels.
Check the coolant level, which should be between the minimum and maximum marks.
Step 4: Examine Radiator Fan Operation
Start the engine and allow it to reach normal operating temperature.
Listen for the radiator fan to engage, typically a loud whirring noise.
If the fan is not operating, gently tap on the fan motor while it’s running to see if it starts.
Step 5: Use an OBD-II Scanner
Plug the OBD-II scanner into the vehicle’s diagnostic port and retrieve error codes.
Common codes related to overheating include P0128, P0117, P0118, P0480, and P0481.
Cross-reference the codes with the manufacturer’s manual or online resources for specific interpretations and potential fixes.
Addressing Overheating Issues
To effectively address overheating issues in the Hyundai Aero City, immediate actions must be taken to prevent further damage.
This includes assessing repair solutions that not only rectify the root cause but also consider the cost implications of these repairs.
Understanding both the urgency and financial aspects is crucial for maintaining optimal engine performance.
Immediate Actions
What to Do If Your Hyundai Aero City Engine Overheats
If you suspect your Hyundai Aero City engine is overheating, immediate action is crucial to prevent further damage.
Prolonged overheating can lead to severe engine problems, but prompt intervention can mitigate risks and ensure the vehicle’s longevity.
To address overheating issues:
1. Turn Off the Engine
Pull over safely and shut off the engine as soon as you notice the temperature gauge rising or hear warning alarms.
Continuing to drive can exacerbate the problem and lead to severe engine damage.
2. Allow the Engine to Cool
Wait at least 30 minutes before opening the hood to allow engine components and fluids to cool down, reducing the risk of burns or injuries.
3. Check Coolant Levels
Inspect the coolant reservoir once the engine has cooled.
Low coolant levels may indicate a leak or other issues.
Never refill coolant while the engine is still hot, as this can be dangerous.
Repair Solutions
Addressing overheating issues in the Hyundai Aero City requires a careful evaluation of both DIY fixes and professional repairs.
Simple solutions, such as ensuring proper coolant levels and checking the radiator for blockages, can often resolve minor overheating problems.
However, more complex issues may necessitate the expertise of a qualified mechanic to ensure a thorough and effective repair.
DIY Fixes
Step 1: Inspect coolant levels and top them off if necessary to ensure the system is properly filled.
Step 2: Check for leaks in hoses and clamps, ensuring they are secure and not allowing coolant to escape.
Step 3: Clean the radiator to remove any debris or buildup that may be blocking airflow and contributing to overheating.
Step 4: Ensure proper airflow around the radiator by clearing any obstructions and making sure the grill is not clogged.
Step 5: Regularly maintain the cooling system to prevent future overheating issues and extend the life of the vehicle.
Professional Repairs
Professional repairs can effectively resolve overheating issues in the Hyundai Aero City by identifying and addressing underlying causes.
Common causes of overheating include:
- Coolant leaks
- Faulty thermostats
- Malfunctioning water pumps
Expert technicians use advanced diagnostic tools to perform comprehensive inspections and pinpoint the root cause of the issue.
They then implement precise repairs to restore optimal engine function.
Regular maintenance services can also prevent future overheating issues, ensuring reliability and longevity of the vehicle.
This includes:
- Regular coolant checks
- Thermostat replacements
- Water pump maintenance
Cost Analysis of Overheating Repairs
What is the cost of overheating repairs?
Overheating can cause significant damage to your vehicle’s engine, resulting in costly repairs.
To avoid these expenses, it’s essential to address the issue promptly.
Replacement Parts
- Radiator Replacement: $500 (potential cost if ignored: $1,500)
- Thermostat Replacement: $300 (potential cost if ignored: $800)
- Water Pump Replacement: $700 (potential cost if ignored: $2,000)
- Head Gasket Replacement: $1,500 (potential cost if ignored: $4,000)
- Fan Motor Replacement: $400 (potential cost if ignored: $1,200)
- Hose Replacement: $100 (potential cost if ignored: $300)
Maintenance and Repair
* Cooling System Flush: $150 (potential cost if ignored: $500)
Engine block repair is a more extensive and expensive repair that can result from ignoring overheating issues.
* Engine Block Repair: $2,000 (potential cost if ignored: $5,000)
Ignoring overheating issues can lead to more extensive and expensive repairs down the line.
Regular maintenance and prompt repairs can help prevent these costs and ensure your vehicle runs smoothly.
Preventing Overheating
Preventing Overheating: A Maintenance Schedule
To prevent overheating, it’s essential to follow a regular maintenance schedule.
A well-maintained cooling system is crucial to preventing overheating and ensuring the longevity of your vehicle.
Monthly:
Check the coolant level in the reservoir and top it up with the appropriate coolant mixture if necessary.
Every 6 months:
Inspect the radiator and coolant hoses for signs of wear, leaks, or blockages.
Clean the radiator fins to maintain airflow and cooling efficiency.
Every 2 years:
Flush and replace the coolant to remove debris and prevent corrosion.
Inspect the water pump for leaks and proper operation.
Annually:
Check the thermostat functionality to ensure it opens and closes properly.
Weekly:
Monitor the engine temperature gauge while driving.
If the gauge consistently runs higher than normal, it could indicate potential overheating.
Additional Tips:
Replace the air filter every 12,000 miles to improve engine performance and prevent overheating.
If you suspect any issues with your cooling system, consult a professional mechanic to avoid further damage.
Warranty Considerations for Overheating Issues
Hyundai’s standard warranty covers the cooling system components, including the radiator, thermostat, water pump, and cooling fans, for a specified duration (e.g., 5 years/60,000 miles).
This coverage includes repairs or replacements of defective parts under normal driving conditions, provided that the overheating was due to a manufacturing defect and not due to improper maintenance or external factors.
Exceptions and Exclusions
Warranty coverage may be impacted by:
- Negligence in maintenance (e.g., failing to perform regular coolant changes or inspections)
- External damage (e.g., accidents, impact, or environmental factors like flooding)
- Coolant contamination (e.g., using the wrong type of coolant or contaminated fluids)
- High-performance driving (e.g., racing, off-roading, or other high-stress driving conditions)
Required Documentation for Warranty Claims
To file a warranty claim for overheating issues, you’ll need:
- Proof of ownership (vehicle title or registration)
- Maintenance records (detailed records of regular maintenance, including service receipts for coolant changes, inspections, and previous repairs)
- Diagnostic report (report from an authorized Hyundai dealer or certified mechanic indicating the diagnosis of the overheating issue and confirming warranty coverage)
- Claim form (completion of the manufacturer’s warranty claim form, requiring specific details about the overheating incident and relevant history)
Aftermarket Modifications and Warranty Impact
Aftermarket modifications can void warranty coverage or limit coverage to certain parts of the vehicle.
- Void warranty clauses may apply if modifications cause overheating issues
- You may need to prove that the modification did not cause the overheating issue
- Partial coverage may apply if modifications only affect certain parts of the vehicle
Comparing Overheating Issues to Other Compact Vehicle
When it comes to compact vehicles, overheating can be a major concern. It can lead to engine damage, costly repairs, and even safety hazards. Here’s a comparison of the Hyundai Aero City’s overheating issues with its competitors.
Overheating Frequency and Repair Costs
| Model | Overheating Frequency | Common Causes | Avg. Repair Cost |
|---|---|---|---|
| Hyundai Aero City | Moderate | Coolant leaks, thermostat failure | $800 – $1,200 |
| Toyota RAV4 | Low | Low coolant levels, radiator issues | $500 – $800 |
| Honda CR-V | Low | Blocked radiator, water pump failure | $600 – $900 |
| Ford Escape | Moderate | Low coolant, fan malfunction | $700 – $1,000 |
| Nissan Rogue | Moderate | Coolant leaks, sensor issues | $600 – $900 |
The Hyundai Aero City has a moderate overheating frequency, mainly due to coolant leaks and thermostat failures, with average repair costs ranging from $800 to $1,200. In contrast, the Toyota RAV4 and Honda CR-V have low overheating frequencies, making them more reliable options. The Ford Escape and Nissan Rogue experience moderate overheating frequency, but with slightly lower average repair costs.
Hyundai Aero City Engine Overheating: Real-World Cases and Solutions
Overheating is a common issue that Hyundai Aero City owners face, and it can be caused by various factors.
It can be caused by various factors. Here are three real-world cases that highlight the importance of regular maintenance, prompt diagnosis, and understanding the cooling system’s components.
Case 1: Overheating During Long Drives
A Hyundai Aero City owner experienced consistent overheating during long-haul trips, especially in hot weather.
The temperature gauge would spike after driving for more than an hour, accompanied by a burning smell and occasional engine warning light flickers.
After inspecting the coolant levels, the owner took the vehicle to a certified Hyundai mechanic, who identified a failing water pump and a partially clogged radiator.
Replacing these components and flushing the cooling system resolved the issue.
Case 2: Overheating After Engine Replacement
Another owner faced overheating issues shortly after an engine replacement under warranty.
The vehicle would overheat within 30 minutes of driving, with no visible coolant leak.
The dealership’s service team diagnosed a stuck-closed thermostat, preventing proper coolant flow, and replaced it.
This resolved the issue, highlighting the importance of thorough diagnostics and follow-up checks after major repairs.
Case 3: Overheating in Urban Traffic
A third owner experienced overheating when driving in stop-and-go traffic, particularly during summer months.
The engine would heat up quickly, causing anxiety about potential damage.
The owner noticed that the issue was less severe during highway driving and monitored the temperature gauge, noting that it spiked during idle periods.
A faulty fan relay was diagnosed, and replacing it resolved the issue, emphasizing the importance of the cooling fan’s role in maintaining engine temperature in urban settings.
Expert Opinions on Engine Cooling System
To maintain the engine cooling system of your Santa Cruz, follow these top expert recommendations:
Regular Coolant Level Checks
Maintaining the proper coolant level is crucial for the engine’s cooling system to function effectively.
Low coolant levels can lead to overheating, causing severe engine damage. Periodically check the coolant reservoir, especially before long trips or during seasonal changes.
If levels are low, top off with the manufacturer-recommended coolant.
Inspect and Replace the Radiator Cap
A faulty radiator cap can lead to coolant leaks or allow air into the cooling system, causing overheating.
Inspect the radiator cap for cracks or signs of wear.
If it appears damaged or if the engine is overheating, replace it with a new one that meets OEM specifications.
Thermostat Functioning and Maintenance
The thermostat regulates the flow of coolant to maintain the engine’s optimal temperature.
A malfunctioning thermostat can cause the engine to run too cold or too hot.
Have the thermostat tested during routine maintenance.
If it’s sticking open or closed, replace it to ensure the cooling system operates properly.
Radiator Maintenance and Replacement
A clogged or dirty radiator can impede airflow and reduce cooling efficiency, leading to engine overheating.
Periodically inspect the radiator for dirt, debris, or corrosion.
Clean the exterior fins with a soft brush and garden hose.
If heavily blocked or damaged, consider professional cleaning or replacement.
Cooling Fan Maintenance
Cooling fans regulate engine temperature, especially at low speeds or when idling.
If they aren’t working properly, the engine may overheat.
Test the cooling fan operation by observing if they engage when the engine reaches a certain temperature.
If they are not functioning, check the fuses and wiring, and replace the fans if necessary.
Related Issues
When diagnosing Hyundai Aero City engine troubles, it’s essential to differentiate overheating from related issues that can cause similar symptoms.
Coolant Leaks: Puddles of coolant under the vehicle or a drop in the coolant reservoir level can indicate a leak.
Unlike overheating, which often results in a rising temperature gauge, coolant leaks may not immediately affect engine temperature. However, persistent leaks can eventually lead to overheating if not addressed.
Thermostat Malfunction: A stuck thermostat can cause the engine to run cooler or hotter than normal, resulting in fluctuating temperature readings.
If the engine is running colder than normal but still exhibits signs of sluggish performance, it may indicate a thermostat issue rather than overheating.
Water Pump Failure: A failing water pump may produce a whining noise, leak, or show signs of corrosion.
Unlike overheating, a bad water pump may not cause immediate temperature spikes but can lead to overheating over time.
Radiator Issues: A clogged or damaged radiator can restrict coolant flow, causing engine temperature to rise.
If the engine temperature is high but you notice debris or blockage in the radiator, this could be the issue.
Air in the Cooling System: Air pockets can cause erratic temperature readings or localized overheating.
If the engine temperature fluctuates wildly or shows high temperatures after service, it may indicate trapped air rather than a genuine overheating scenario.
Faulty Temperature Gauge or Sensor: An inaccurate temperature reading can lead to confusion regarding the actual engine temperature.
If the temperature gauge reads high but the engine appears to be running normally, the sensor or gauge may be faulty.
Understanding these related issues can help vehicle owners take appropriate action before facing serious engine damage.
Regular maintenance and inspections can identify these problems early, ensuring optimal engine performance and longevity.
People Also Ask
Can Engine Overheating Affect Fuel Efficiency in the Hyundai Aero City?
Yes, engine overheating can affect fuel efficiency in the Hyundai Aero City. When the engine overheats, it causes increased friction and reduces combustion efficiency, leading to higher fuel consumption and decreased overall performance.
How Does Driving Style Influence Engine Overheating in the Aero City?
Aggressive driving, like speeding and rapid acceleration, can cause engine overheating. On the other hand, gentle acceleration and moderate speeds help keep the engine cool.
Are There Aftermarket Solutions for Overheating Issues in the Hyundai Aero City?
Yes, aftermarket solutions for overheating issues in the Hyundai Aero City include performance radiators, high-capacity cooling fans, upgraded thermostats, and enhanced coolant systems.
What Is the Average Cost of Fixing Overheating Problems in the Aero City?
The average cost to fix overheating problems in a car is between $200 and $1,500, depending on the repairs needed, like replacing the radiator, thermostat, or water pump.
Is There a Recommended Coolant Type for the Hyundai Aero City Engine?
The recommended coolant type for the Hyundai Aero City engine is a 50/50 mix of ethylene glycol-based antifreeze and distilled water, as specified in the owner’s manual.