Radiator Fans not working

Tiny
MRSLJBABLER
  • MEMBER
  • 2006 PONTIAC GRAND PRIX
Engine Cooling problem 6 cyl Front Wheel Drive Automatic 55,000 miles

The fans are not coming on. What could be the cause of this?

Thank you.
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Thursday, November 12th, 2009 AT 8:45 PM

11 Replies

Tiny
BMRFIXIT
  • EXPERT
Coolant fan works only as needed
do you have an overheating issue and if not all should be OK
if not check fuses and relay
do a code check
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Thursday, November 12th, 2009 AT 8:48 PM
Tiny
MRSLJBABLER
  • MEMBER
Yes, It was overheating and loosing coolant. We could not locate a leak, we replaced the thermostat and now we found that the fans are not working. Can you tell me where I can locate the fan switch and fan relays so that I can check them?
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Thursday, November 12th, 2009 AT 9:11 PM
Tiny
BMRFIXIT
  • EXPERT
Did you check for codes

check fuses and relays under the hood


http://www.2carpros.com/forum/automotive_pictures/99387_fan_1.jpg

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Thursday, November 12th, 2009 AT 9:25 PM
Tiny
MRSLJBABLER
  • MEMBER
I checked the fuses but I am not sure the relays were checked. Is there a fan switch I can check? And what codes and where would I find them?
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Thursday, November 12th, 2009 AT 9:29 PM
Tiny
BMRFIXIT
  • EXPERT
If its the switch or the coolant sensor check engine light would be on and
you need an OBDII reader to access the codes
most local part stores can help you in getting the codes for free
or use the OBDII reader for a deposit that you get back upon returning it
check with your local store for their policy
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Thursday, November 12th, 2009 AT 9:37 PM
Tiny
MRSLJBABLER
  • MEMBER
Will this reader tell us what the problem is then? Like a diagnostic?
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Thursday, November 12th, 2009 AT 9:42 PM
Tiny
BMRFIXIT
  • EXPERT
Sure should tell something specially if have check engine light on
this is a site where you can check them and what they do
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Thursday, November 12th, 2009 AT 9:50 PM
Tiny
MRSLJBABLER
  • MEMBER
What if the CHECK ENGINE LIGHT hasn't come on. Will that reader still identify the problem?
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Saturday, November 14th, 2009 AT 12:36 AM
Tiny
BMRFIXIT
  • EXPERT
This reader will not, you need a scanner to communicate with the PCM (computer )and check what is going on
does the fan come on when AC on?
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Saturday, November 14th, 2009 AT 6:27 AM
Tiny
NEILPARK2
  • MEMBER
I have the same problem both of my fans will not turn on ive checked the fuses but am not sure what else do as I do not have an check engine light on. The heat gage rises really quickly but does not quite over heat but it will if I sit for too long in traffic on a hot day. It has ac and hot air perfect. 2008 grand prix 3800 v6
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Saturday, June 3rd, 2017 AT 7:12 PM
Tiny
KEN
  • ADMIN
Hello,

It sounds like a relay could be bad or a fuse, Here are some guides and the radiator fan wiring diagram (below)

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken
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Tuesday, June 6th, 2017 AT 2:31 PM

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