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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

‘92 Pontiac Grand Prix, Cooling Fan Operation

Q: I went out and got a new car. It was a Ď92 Pontiac Grand Prix 3.1 MFI V6. Now the problem is the car overheats and kills the car. It will turn back on, but if you go to put it in gear, it will die. The car doesnít smoke or give out steam. I put 2 new parts in it, a temperature sensor, and a thermostat and I still cannot get the fans to kick in. I checked all the wires and looked at all the plugs under the hood. What makes the fans kick in? I cannot find that out. If you could help me that would be great!

- Jennifer Beenken

A: The information youíre providing is a bit of a mixed bag. An engine that is overheating so much that it stalls, if not damaged, soon will be if driven under those conditions. I canít help wonder if you have 2 different problems that youíre tying together. Because a stalled engine cannot damage itself letís focus on the overheating and/or cooling fan problem. The cooling fan is computer controlled. The computer will activate or deactivate the cooling fan with information from the coolant temperature sensor, A/C request and vehicle speed. A simple test of cooling fan operation can be done by grounding the B terminal on your vehicleís diagnostic connector. Grounding this terminal will cause the cooling fan to be activated. If the fan doesnít turn on then you need to check the fuses in the Right Side Electrical Center that is located under the hood on the right hand side in front of the strut tower. There is a 10 amp fuse marked IGN FUSE. If the fuse is good you donít have to go too far to find the relay for the cooling fan; itís in the same electrical center. While youíre in there check the fusible element marked ďNĒ, this is the main power supply for the cooling fan motor. If all checks good and cooling fan is still not working, then you need to go to the connector for the cooling fan to see if electrical power is present and the ground wire is good. If theyíre good you likely have a bad cooling fan motor.

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