Question about 1995 Chevrolet Monte Carlo

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Overheating Replaced almost everything that I thought was the problem(thermostat, temperature sensor, fan switch and relays, radiator[it was leaking]), besides the water pump. The pump is pumping water, though, so I am assuming this isn't an issue. The fans aren't even coming on when it gets hot, and it gets hot rather quickly.

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  • stevendglove Dec 12, 2008

    No fluid mixtures, or headgasket problems. Fans work when power is directly attatched, but doesn't function when engine is hot. Initially overheated under regular driving conditions, and currently overheats even at an idle. Replaced lAT sensor also, and still overheats. MAP sensor is the only one that hasn't been changed. Can you disconnect the air filter assembly and see if MAP sensor is a problem that way? Or ECM is a problem?

  • Angelo Attard
    Angelo Attard May 11, 2010

    the computer is involved running the fan dont listen to that donkey

  • Angelo Attard
    Angelo Attard May 11, 2010

    sounds like a computer problem put air con on and see if fans come on they should i would connect fan directly and drive car if it dosnt overheat then it is the computer not communcating to the fans and temp sensor had same problem with holden

  • Angelo Attard
    Angelo Attard May 11, 2010

    hi have checked the fan for power when it is hot when does it overheat stopped or at high speed

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  • 740 Answers

Make sure you don't have a bad head-gasket. Check for excessive pressure in radiator or hoses. Check under oil cap for creamy/milk like residue or actual antifreeze in oil or the opposite oil in antifreeze. Let me know what you find. Good Luck

Posted on Dec 12, 2008

  • O Mclean Dec 12, 2008

    Therefore there is an electrical problem where the fan doesn't get power. Check to see if there is power at the fan relay. The fan sensor is thermal type sensor it completes the circuit at the relay and the relay turns that fan on. This fan is not controlled by the computer. Double check all wiring that goes to the fan relay. By disconnecting the air filter assemble would not tell if MAP

    sensor is not working. A bad map sensor will just enrich the fuel mixture and if really bad, may make your CAT get cherry red, but I don't think the map has anything to do with this problem. Remember map-manifold absolute pressure. You seem to have an electrical problem with the fan circuit. Take your time and check when engine it hot to make sure that the sensor is ready to turn the fans on, Good Luck .

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