Question about 1990 Chevrolet K2500

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Blower fan runs when truck is turned off. replaced ignition swith last night. no change

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Fan relay is stuck or the resistor needs replcing

Posted on Jul 02, 2009

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Blower Motor problem


Hi,

Sorry but most that I can give would be generic as Pontiac Grand Prix are not that common in my country. I am assuming you are referring to the fan/blowers of the A/C unit.

Based on your description and from what little I know of the circuitry/wiring of current blowers:
1. the clicking sound would be a relay engaging and therefore the speed selector switch could be assumed to be operational since it can trigger the relay;
2. the day time running lights and auto night lights turning off when engaging the fan switch indicates possibly a common supply problem. This could be a wire or terminal in the fuse block. This common B+12 supply logically would be split into several including the fan blower fuse and the lights fuse. It is also possible that said terminal is corroded or has scorched marks preventing full flow of current or be disconnected intermittently;
3. since you have changed the resistor (presumably known and tested to be good) then the problem lies elsewhere possibly back to #2 above;
4. I would discount any ignition problem as it would be more engine related and has nothing to do with the fan/blower except that it share a common IGN B+12 which again points back to possibly #2; and
5. Though am not sure, but I think your car has also a blower motor control processor which also could be at fault.

I believe your best option would be to use a DVM to check for the presence of B+ supply to the fan motor while going through the switch settings (1 to 5). Thereafter trace back until you reach the resistor and its input of +12, go further back and trace it to the fuse holder and eventually to the common supply. You would have three (3) B+12, a) always ON; b) IGN ON; and blower switch ON.

Would appreciate a post back for any developments or results of your voltage checks.

Hope this be of initial help/idea. Again, pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 03, 2008 | 2001 Pontiac Grand Prix

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