Question about 1993 Pontiac Grand Am

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We have a 1993 Pontiac Grand Am that overheats. The cooling fan will not come on unless we turn the key to accessory mode with the scanner attached

Also, with the scanner removed and a jumper between terminal a and b, the fan will run. What is wrong? Fan does not operate under normal driving conditions. The temperature sensor, fan relay, thermostat, radiator, water pump all have been replaced. Along with timing chain, head gasket. When driving the dash temperature gauge runs to hot but even when the ignition is off the temperature gauge shows 200 degrees, does not return to zero.

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Problem with dash board. Bad contact. Reconect all conector and conect again...

Posted on May 15, 2014

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Posted on Jan 02, 2017

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SOURCE: 97 Pontiac grand am overheats as soon as it gets to running temp

If electric fans are coming on, and you have filled the system with the heater turned on high to purge it of air, even though you flushed it, I'd have the radiator flow tested (even when flushing, coolant tends to go around internal blockages, limiting its ability to work correctly) otherwise you need to begin testing from square one like you had never seen it before (don;'t assume anything you did is working) Pressure testing of coolant system, hydrocarbon test at fill opening and engine compression tests are important as well as what I mentioned above.

Posted on Jul 16, 2009

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SOURCE: I have a 2000 Pontiac

There are 2 temp sensors on this motor, try replacing the other one in the block.

Posted on Jan 12, 2011

  • 878 Answers

SOURCE: My Grand Prix stared running

are you sure that the radiator is not clog ,also check the cap for broken gasket also check the hoses for stiffness i would also wanna run it without thermostat to see what happens ,some times they come defected from manufacturer good luck

Posted on Mar 30, 2011

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aquaman987
  • 927 Answers

SOURCE: I Have a 1997 Pontiac

What's chances that the temperature gauge or sender itself is wrong?
Is the heat exceptionally hot? What temperature is the heater dicharge when the gauge reads 260?
I think that the sender is not expensive, try that. An auto parts store could get you an inexpensive dial gauge that you might be able to install in place of the sender.
Gary

Posted on Aug 02, 2011

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