Edmunds Answers

Voted Best Answer

  • avatar MrShift@Edmunds 08/23/09 2:58 pm PST

    It's not a good sign that your mechanic appears lost already. Overheating can be a complex issue. If you have a quick, idle speed overheat this is generally an air circulation problem (since there is no air flowing, as the car is standing still, and thus requires cooling fans). So you have to check that your electric cooling fan is working first of all.

    If the fan or fans are going full blast, and you are still overheating rapidly, you might have an air blockage in the cooling system (failure to bleed the system properly when adding coolant or replacing the thermostat).

    If no blockages, you might pressurize the cooling system and check for a head gasket failure by removing the spark plugs, while the system is pressuized, and check for coolant on the plug tips.

    You might also have a clogged radiator, which your mechanic should be able to diagnose by a flow-test, or even feeling the upper and lower radiator by hand.

    Water pump is possible but generally if a water pump is failing, it is also making lots of noise and leaking badly.


Answers

  • MrShift@Edmunds 08/23/09 2:58 pm PST

    It's not a good sign that your mechanic appears lost already. Overheating can be a complex issue. If you have a quick, idle speed overheat this is generally an air circulation problem (since there is no air flowing, as the car is standing still, and thus requires cooling fans). So you have to check that your electric cooling fan is working first of all.

    If the fan or fans are going full blast, and you are still overheating rapidly, you might have an air blockage in the cooling system (failure to bleed the system properly when adding coolant or replacing the thermostat).

    If no blockages, you might pressurize the cooling system and check for a head gasket failure by removing the spark plugs, while the system is pressuized, and check for coolant on the plug tips.

    You might also have a clogged radiator, which your mechanic should be able to diagnose by a flow-test, or even feeling the upper and lower radiator by hand.

    Water pump is possible but generally if a water pump is failing, it is also making lots of noise and leaking badly.


  • Stever@Edmunds 08/23/09 7:22 pm PST

    You can reply in this thread by clicking the Answer this Question button and that will help keep all the information in one spot. Thanks!

  • 251_intrepid 08/24/09 1:52 pm PST

    Thanks for the response! I have recently had issues and 1st had thermostat replaced, then radiator, then waterpump and timing belt but cooling fan was said to be good by mechanic whom replaced radiator. Well today it goes hot on me again. antifreeze is full but only the temp is about 95%. turned on the heat and all went down. having reliable mechanic diagnose (who replaced waterpump) now. My guess is the cooling fan component since we I started the car it didn't come on but when the ac was cranked up it came on momentarily. Or could be a sensor...

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