97 grand prix cooling fans will not stop running when car is off and cooled down. i have replaced the relay module and temp sensor. that seemed to work for couple days and now the fans stay on again and drain the battery, any other ideas what could be wrong?

Asked by Nov 16, 2014 at 10:07 AM about the 1997 Pontiac Grand Prix 2 Dr GTP Supercharged Coupe

Question type: Maintenance & Repair

23 Answers

17,840

Look at the wires from the fan to the fuse box and from the fan to the sensor. Look for cuts, nicks, corrosion or melted wires. Also check all of the connectors and connections. Look for corrosion inside the plugs or wires that have pulled out of the connectors.

Ok i will do that TransAm77.

TransAm77 should both fans be running while car is running? isn't one for the air conditioning? i check all the wires and found nothing.

17,840

The fans kick on when the car gets hot near 185-195. Mostly when sitting while running like at a stoplight. No air is blowing through the radiator while sitting. The fans kick on to suck or blow air through the radiator while stopped. The weather has gotten much cooler and it will take longer for the car to get that hot or may not come on at all. No neither is for the air conditioning. Yes they both should run when the engine is hot but only as needed. When you replaced the temp sensor did you replace the gauge sending unit or the fan sending unit? Sometimes there are 2 different ones.

Not sure exactly what you mean by the gauge sending unit or fan. where exactly are those located

17,840

There are sending units screwed into the block or sometimes the intake that read the engine temp. There is one for the dash gauge or warning light and there might be one separately for the cooling fans.

so the temp sensor is something separate than this for the fans is what your saying. sorry i am just a basic guy trying to fix my daughters car for cheap without taking it in..lol

17,840

No need to be sorry. I learn stuff about vehicles daily. My kid has an 02 grand prix gt. I know the cars fairly well. If you said you replaced the sensor in your original post where was it located?

right below the thermastat

the thermastat has a bleeder valve on it would bleeding that help any?

17,840

Yes there are 2 sending units both close to each other. One is for the dash and one is for the ECM. The ECM is what controls the fans. So if you replace that sending unit and they still run its probably the ECM itself. No don't mess with the bleeders unless you have opened up the cooling system.

is the ecm in the fuse box

17,840

Under the air filter box. If you do have to replace it it will have to be reprogrammed by a dealer or a real good mechanic with that capability.

17,840

So I'm willing to bet you didn't chase those wires, LOL? Follow the other sending unit to the fans and to the ECM. Cross your fingers it the wires or a bad sending unit.

ok thanks. any way to test that?

17,840

The ECM, no not at home. You need a GM Tech2 scan tool. Check the wires first, replace the sender for the ECM then worry about the ECM if the other 2 don't fix it.

ok thanks. now i got another problem with the power steering. argh. thanks again for your help. looks like i am going to have to decide what to do. thinking it is time to cut my losses. i do appreciate your help

17,840

Not a problem. What's up with the p/s?

whines and found fluid all over the garage.

argh cant catch a break. i just let it run for about half hour and see what would happen and let it sit for ten or fifteen mins and fans still running. sucks not having the tools to take care of all of this crap. thanks again. will go have some beer and eat and think on it over night and decide what to do. again thanks for your help.

17,840

Awww man that stinks. Do you by chance live near northern Illinois? I will be selling my kids car in about a month if your interested?????

lol..i live in minnesota. thanks though. the car sucks and the vikings sucked today. oh well. beer is cold.

17,840

Ugh yea, a little far to travel for my daughters 2002 Grand Prix, LOL. Yea without A/P the vikes are not looking to good. I'm not a Bears fan just so you know. All you have to do with the beer to keep it cold is leave it outside. The p/s leak could be just a bad hose. How many miles on your daughters G/P?

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