I have a 1999 Pontiac Grand Am SE 4dr 2.4L engine. I noticed for a while my engine was running a little hot but it wasn’t over heating. Recently I was in a drive thru waiting and it got a little too hot so I pulled over. I checked the fans and they weren’t running even though the car was overheating. The fuses looked good. I verified the fans are able to run by putting a jumper in their relays and they both started. I didn’t check the relays per/say however I moved them around and the fans still didn’t turn on. Although I didn’t check the relays I don’t think they would all be bad. Then I pulled off the connector to the temperature sensor. I jumped it and the fans didn’t start. I measured the voltage on it and there was none. I believe this should show 5 volts. Just for verification this sensor is on the right side of the engine (from the front of the car) in a plastic multi-hose connector. I also turned the air conditioner on which should make the fans run but nothing.
Another thing that has occurred is the air conditioner stopped running. I’m not sure why. It worked fine before winter but this summer nothing. I checked the low pressure with a self fill kit and it showed it has the needed pressure.
I’m also having an issue that recently started where the oil pressure light turns on sporadically even when I’m not low on oil. It seems to come on usually when I’m slowing down or stopped then turns off when I’m driving. It is sporadic though and doesn’t do this every time.
The final thing that happened a year or so ago is my gauges all stopped working. This was on a trip and I was driving several hundred miles coming back. I drove for a while without the gauges and stopped in a small town. When I started the car the gauges started working again. This has never happened since.
My suspicion is my PCM might be having issues. Please let me know your thoughts and what, if anything, I should try?