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Why is my car overheating but the radiator stays cool?

There are several reasons why your car might be overheating while the radiator remains cool:

1. Faulty Thermostat:

- A faulty thermostat can prevent coolant from flowing through the radiator, causing the engine to overheat while the radiator stays cool.

2. Clogged Radiator Hoses:

- Blocked or kinked radiator hoses can restrict coolant flow, leading to overheating.

3. Defective Water Pump:

- A malfunctioning water pump may not be circulating the coolant effectively, resulting in localized overheating.

4. Leak in the Cooling System:

- A leak in the cooling system can lead to low coolant levels, which can cause overheating. Check the coolant reservoir or radiator for any visible leaks.

5. Air Pockets in the Cooling System:

- Air pockets can develop within the cooling system and prevent proper coolant circulation, causing localized overheating.

6. Blockages in the Radiator:

- The radiator may be blocked by debris, leaves, or other materials that obstruct airflow, affecting its cooling efficiency.

7. Faulty Radiator Cap:

- A faulty radiator cap may not be able to maintain the correct pressure within the cooling system, causing overheating.

8. Defective Temperature Sensor:

- A faulty temperature sensor might be giving incorrect readings, leading to an inaccurate indication of engine temperature.

9. Problem with the Fan or Fan Clutch:

- If the cooling fan or its clutch is not functioning correctly, sufficient air may not be flowing over the radiator, resulting in overheating.

10. Head Gasket Issues:

- A blown or damaged head gasket can allow exhaust gases to enter the cooling system, causing localized overheating.

If you're experiencing engine overheating, it's important to thoroughly inspect the cooling system, including the thermostat, hoses, water pump, and radiator, to determine the exact cause and address the problem. If you're not comfortable doing this yourself, it's advisable to have your car inspected and repaired by a qualified mechanic.