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Why is car overheating?

Updated: 9/11/2023
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9y ago

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There are many possible reasons. You need to start by checking-

1. coolant level- If it is low, refill and recheck. There might be a coolant leak and you can get the system pressure checked, could be a blow head gasket. Coolant has a smell that is unique, if you smell something check for drip marks under the car after being parked. A leak from the radiator, hoses, temp sensor will usually have a residue/color stain.

2. check to see if the fan is working- a blow fuse/relay/motor if it is electric. If it has a clutch, check for clutch leaking fluid. It should have resistance when manually spinning when the engine is off.

3. check for debris in the grill radiator, blockage will reduce air flow.

4. Is the check engine light on? Have the codes read, it can diagnose sensor faults, misfires, blow head gasket.

5. Has the thermostat ever been replaced? with the engine warm, check the coolant return hose to radiator is warm, be careful if you have a mechanical fan. If the engine is at or above normal operating temperature and the hose is not hot the thermostat is stuck closed.

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9y ago
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9y ago
  1. Low of coolant
  2. Thermostat stuck closed
  3. Cooling fan not working
  4. Blown head gasket, cracked head, or both
  5. Radiator clogged
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Q: Why is car overheating?
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