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

Fern03
50

Asked by Fern03 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
875

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
50

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???

5 out of 5 people think this is helpful.
zoneman
875

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
4,865

how hot did it go up to? 220?

3 out of 3 people think this is helpful.
zoneman
875

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 4,113 nationwide Grand Prix listings starting at $1,488.
ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 2,480
#2 Tom Demyan
Tom Demyan
Reputation 1,810
#3 John Saffrahn
John Saffrahn
Reputation 1,260
View All

Related Models For Sale

Used Chevrolet Impala"
1,409 Great Deals out of 49,630 listings starting at $995
Used Pontiac Bonneville"
8 Great Deals out of 738 listings starting at $1,995
Used Pontiac Grand Am"
15 Great Deals out of 1,926 listings starting at $995
Used Chevrolet Monte Carlo"
33 Great Deals out of 1,852 listings starting at $1,499
Used Chevrolet Malibu"
919 Great Deals out of 63,246 listings starting at $1,000
Used Ford Mustang"
770 Great Deals out of 31,720 listings starting at $1,800
Used Nissan Maxima"
357 Great Deals out of 18,579 listings starting at $1,499
Used Chevrolet Camaro"
476 Great Deals out of 30,551 listings starting at $2,000
Used Nissan Altima"
1,019 Great Deals out of 70,787 listings starting at $700
Used Toyota Camry"
1,243 Great Deals out of 77,182 listings starting at $800
Used Honda Accord"
1,081 Great Deals out of 72,117 listings starting at $1,200

Used Cars For Sale

2007 Pontiac Grand Prix GT For Sale
5 Great Deals out of 108 listings starting at $3,499
2006 Pontiac Grand Prix GT For Sale
4 Great Deals out of 137 listings starting at $2,600
2005 Pontiac Grand Prix GT For Sale
5 Great Deals out of 170 listings starting at $2,200