Was working fine a few weeks ago when I last took it out but thought I'd take it round the block before I did some more work prior to mapping and the fan comes on when I start it, typical! I seem to be getting a good reading from the sensor and when it hits 90c the thermostat is opening and the temp drops down again. I've found tons of threads on here and other sites but none seem to have a conclusion!
mine used to do this when i removed the aircon, plugged the pressure sensor back it with a bolt in the end of it and it never came back on
It has actually, I had to charge the battery and an error code flaged up a charging/battery issue. I notice its only 13.6v running, maybe the alternator is on its way out?
I charged the battery to full but maybe its goosed? Had an issue with one of my other cars, battery charger was showing full but it wasn't holding much charge.
Swapped the battery with one from another car and there's no change, annoying! Seriously considering abandoning the whole project, doing my head in now!
Took them apart, cleaned them up etc and still the same. Thinking out loud here, can't be thermostat sticking open, that would just cause it to stay cold and it will get up to temp then drop as the stat opens. Getting a good reading from temp sensor so unlikely to be that. Aircon has never been plugged in so no change there. Negatives and other connections seem good. Tried a different battery and was the same. Quickly running out of ideas here!
We are good Took the relay switch for the fan out, cleaned it up, put it back and boom, back in action! Ran the engine up to temp and the fan is coming when needed so all seems good!
