Cooling fans not working on my Grand Prix GT. replaced all 3 relays & eng coolant temp sensor & added a new thermostat . Any ideas ????

Fern03
60

Asked by May 01, 2012 at 04:57 PM about the 2002 Pontiac Grand Prix GT

Question type: Maintenance & Repair

Is there some thing I have missed in my checks???

6 Answers

jayjay101
105

check all fuses seen this where a fuse marked fore something else actually had power to the secondary panel test every one ok even if you think you already did

3 out of 3 people think this is helpful.
zoneman
915

I think there are two temperature sensors, one that reads out in the instrument cluster and a seperate one that controls the radiator fan (s). When you turn on the AC the radiator fan (s) should come on. If not you may have a bad fan motor or the secondary temp sensor I mentioned. Try taking 12 volts from the battery straight to the fan motor, if it doesn't run....the motor is bad. Good luck with it.

9 out of 9 people think this is helpful.
Fern03
60

Already checked both fan motors to direct power and they are fine. Have replaced eng coolant sensor & dash meter is working... Have in clipped wiring to temp sensor & made a open loop to engage fans at high, fans will not run with A/C on as well... Power running to wiring harnesses so lost as to what to check next???

6 out of 6 people think this is helpful.
zoneman
915

If both temp sensors are known to be good and all of the relays are known to be good you might try jumpering the relay contact sockets (bad connection). If none of these things bring the fan(s) on you may very well have a computer problem. The signal from the fan temp sensor tells the computer to energize the fan relay so once again if the fan temp sensor is good the relays, connections, and motors are good it only leaves the computer. Good luck with it.

4 out of 4 people think this is helpful.
Jason Zane
5,315

how hot did it go up to? 220?

3 out of 3 people think this is helpful.
zoneman
915

In most cases the power is applied to motors, lights , etc. the control relay is making and breaking the ground. Just thought I'd bring this up to you as you said the harness had power on it, that would be a normal situation any time the battery is connected. Good luck with it.

Your Answer

Add photo

Related Questions

Grand Prix
Looking for a Used Grand Prix in your area?
CarGurus has 4,913 nationwide Grand Prix listings starting at $1,990.
ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,080
#2 Tom Demyan
Tom Demyan
Reputation 2,120
#3 John Saffrahn
John Saffrahn
Reputation 1,470
View All

Related Models For Sale

Used Chevrolet Impala"
1,126 Great Deals out of 45,550 listings starting at $2,000
Used Pontiac Bonneville"
8 Great Deals out of 872 listings starting at $1,995
Used Chevrolet Monte Carlo"
15 Great Deals out of 2,161 listings starting at $2,499
Used Chevrolet Malibu"
781 Great Deals out of 57,727 listings starting at $1,800
Used Pontiac Grand Am"
5 Great Deals out of 2,393 listings starting at $999
Used Ford Mustang"
347 Great Deals out of 47,543 listings starting at $1,100
Used Nissan Altima"
845 Great Deals out of 84,322 listings starting at $950
Used Nissan Maxima"
317 Great Deals out of 25,672 listings starting at $1,750
Used Chevrolet Camaro"
273 Great Deals out of 26,374 listings starting at $1,900
Used Honda Accord"
641 Great Deals out of 72,460 listings starting at $999

Used Cars For Sale

2007 Pontiac Grand Prix GT For Sale
8 Great Deals out of 102 listings starting at $4,300
2006 Pontiac Grand Prix GT For Sale
3 Great Deals out of 142 listings starting at $2,400
2005 Pontiac Grand Prix GT For Sale
4 Great Deals out of 186 listings starting at $1,990