1. Cooling Fan Issue: Check if the cooling fan is functioning properly. The cooling fan helps dissipate heat from the radiator; a faulty fan can lead to overheating when the car is stationary.
2. Water Pump Malfunctioning: The water pump circulates coolant through the engine and radiator. A faulty water pump can reduce coolant flow, leading to overheating.
3. Clogged Radiator: Even though you've changed the radiator, it's possible that it could still be partially clogged, hindering proper heat exchange. Check for any obstructions or debris in the radiator.
4. Blocked Radiator Hoses: Examine the radiator hoses for any kinks or blockages that might inhibit coolant flow. Make sure they're securely attached to the radiator and engine.
5. Incorrect Coolant Mixture: Check the coolant level and ensure that it's at the recommended level. Also, verify that you're using the correct coolant mixture; a wrong ratio of water to coolant can affect cooling efficiency.
6. Faulty Temperature Sensor: A faulty temperature sensor may provide incorrect readings to the engine's control unit, causing the cooling system not to respond appropriately.
7. Air Pockets: Sometimes, air pockets can get trapped in the cooling system, leading to overheating. Try bleeding the system to ensure proper coolant circulation.
8. Head Gasket Issue: In rare cases, a faulty head gasket can lead to overheating. This can be difficult to diagnose and may require further inspection by a mechanic.
9. Debris in the Radiator Cap: Check the radiator cap for any debris or obstructions that might prevent it from maintaining the proper pressure in the cooling system.
10. Faulty Radiator Pressure Cap: A faulty radiator pressure cap can also contribute to overheating. It's responsible for maintaining system pressure and preventing coolant from boiling over.
If you've gone through these potential causes and the overheating issue persists, it's best to consult with a qualified mechanic for a proper diagnosis and repair.
