Common reasons for car overheating and how to prevent it.

March 28, 2025 - Engine overheating is a serious issue that can cause engine failure if left unaddressed. This guide explores the causes, early detection, solutions, and expert maintenance tips to prevent this problem.

How the Engine Cooling System Works

Before understanding malfunctions, it's important to know how the cooling system functions:

- Coolant absorbs heat from the engine and moves to the radiator through hoses.

- The cooling fan cools the fluid in the radiator.

- The cooled fluid returns to the engine.

- The thermostat keeps the temperature within a safe range (usually 90-100°C).

Main Causes of Car Overheating

1. Cooling System Issues (8 Common Malfunctions)

According to statistics, the cooling system causes 70% of overheating cases:

- Radiator Blockage: Due to sediment buildup or using water instead of coolant.

- Hose Leaks: Leaks visible under the car.

- Cooling Fan Failure: Stops working when idling or in traffic.

- Thermostat Malfunction: Prevents coolant flow by staying closed.

- Water Pump Weakness: Damaged pump blades prevent effective fluid circulation.

- Air in the System: Causes uneven coolant distribution.

- Internal Radiator Corrosion: Common after about 150,000 km.

- Radiator Cap Damage: Leads to loss of system pressure.

2. Lubrication System Problems (3 Major Issues)

What to Do When the Car Overheats Suddenly?

Follow these steps for emergency action:

1. Stop the car in a safe location.

2. Wait 15 minutes before opening the hood to avoid burns.

3. Check fluid levels (radiator and oil) without opening hot caps.

4. Call a mobile workshop if there's noticeable leakage.

5. Don’t restart the engine until it’s inspected by a professional.

Normal vs. Dangerous Overheating

- Normal Overheating: Occurs during long climbs or hot weather and dissipates after a few minutes.

- Dangerous Overheating: When the gauge stays in the red zone, steam emerges from the engine, or there's a loss of power.

How to Prevent Engine Overheating (7 Key Tips)

1. Replace coolant every 2 years or 40,000 km.

2. Check engine belt tension every 15,000 km.

3. Clean the radiator externally annually.

4. Avoid driving at top speeds for long periods.

5. Use engine oil according to manufacturer’s specifications.

6. Inspect the exhaust system periodically.

7. Ensure the radiator cap is intact during every maintenance check.

FAQs About Engine Overheating

- Can I Use Regular Water in an Emergency? Yes, but only temporarily. Replace it with coolant soon to avoid rust and corrosion.

- How Much Does It Cost to Repair Engine Damage from Overheating?

  - Replacing the thermostat: 150-300 AED

  - Repairing a cylinder head: 2,000-5,000 AED

  - Replacing the engine: 10,000-30,000 AED

- What is the Best Coolant for My Car? Follow the manufacturer's recommendation, which is listed in the vehicle's maintenance guide.