Cooling fans won't turn on any suggestions?

Discussion on Air Conditioning/Heat & electronic controls for the same, radiators/fans/engine cooling and related items.
undrcvrppv
Posts: 98
Joined: Mon Jan 23, 2017 8:11 pm
Location: South side chicago il

Cooling fans won't turn on any suggestions?

Post by undrcvrppv » Mon Feb 17, 2020 2:26 am

I've replaced all the relays under the hood and all the fuses in the fuse box under the hood. The fans will run if I jump them with a 12 volt hot. Not sure what else it could be

smwalker
Posts: 1838
Joined: Mon Jul 29, 2013 6:44 am
Location: Azusa,CA

Re: Cooling fans won't turn on any suggestions?

Post by smwalker » Mon Feb 17, 2020 7:52 am

What year?

And how are you determining they are not on when they should be? Just temp? Or are you seeing a signal to the Relays?

How about when you tun on the AC they come on then?
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White

undrcvrppv
Posts: 98
Joined: Mon Jan 23, 2017 8:11 pm
Location: South side chicago il

Re: Cooling fans won't turn on any suggestions?

Post by undrcvrppv » Mon Feb 17, 2020 2:02 pm

Getting a check engine light. I believe it says fan control module

undrcvrppv
Posts: 98
Joined: Mon Jan 23, 2017 8:11 pm
Location: South side chicago il

Re: Cooling fans won't turn on any suggestions?

Post by undrcvrppv » Mon Feb 17, 2020 2:03 pm

And it is a 2012

smwalker
Posts: 1838
Joined: Mon Jul 29, 2013 6:44 am
Location: Azusa,CA

Re: Cooling fans won't turn on any suggestions?

Post by smwalker » Mon Feb 17, 2020 10:55 pm

Post up the code if you got it but ECM controls the fans on the 11-13 14+ has a module.

Just to confirm there are 3 fuses to check, they all OK?
F32 - EMIS2
FU6 - FAN 1
FU11 - FAN 2
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Screenshot 2020-02-17 at 1.17.55 PM.png (200.98 KiB) Viewed 1280 times
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White

undrcvrppv
Posts: 98
Joined: Mon Jan 23, 2017 8:11 pm
Location: South side chicago il

Re: Cooling fans won't turn on any suggestions?

Post by undrcvrppv » Tue Feb 18, 2020 12:02 am

Will do I replaced all the fuses except the f 32 I will try to get the code tomorrow

smwalker
Posts: 1838
Joined: Mon Jul 29, 2013 6:44 am
Location: Azusa,CA

Re: Cooling fans won't turn on any suggestions?

Post by smwalker » Tue Feb 18, 2020 2:02 am

If the code is anything about the heated oxygen sensors those are on the same circuit as the cooling fans. That's wierd:

Heated Oxygen Sensor - Bank 1 Sensor 2, B52F Heated Oxygen Sensor - Bank 2 Sensor 2, B75C Multifunction Intake Air Sensor (LFX - LFX is V6 I believe)), KR20C Cooling Fan Low Speed Relay, KR20D Cooling Fan High Speed Relay, KR20E Cooling Fan Speed Control Relay
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White

Sanford
Posts: 149
Joined: Tue Dec 13, 2016 3:38 am
Location: Texas Gulf Coast

Re: Cooling fans won't turn on any suggestions?

Post by Sanford » Tue Feb 18, 2020 3:21 am

I would pull the relays out and check to see if you have one socket terminal that is hot all of the time and another that is hot with the key on. Start with the basics.

David

undrcvrppv
Posts: 98
Joined: Mon Jan 23, 2017 8:11 pm
Location: South side chicago il

Re: Cooling fans won't turn on any suggestions?

Post by undrcvrppv » Mon Feb 24, 2020 12:06 am

Just want to say thanks to Steve for pointing out the f32 fuse that I had no idea had anything to do with the cooling fans. Problem solved f32 fuse was bad fans now work again

smwalker
Posts: 1838
Joined: Mon Jul 29, 2013 6:44 am
Location: Azusa,CA

Re: Cooling fans won't turn on any suggestions?

Post by smwalker » Mon Feb 24, 2020 2:48 pm

NIce!!! Yea that's a hidden one!! Especially since it says F44 on the diagram, good ol GM numbering system.
Steve Walker
Azusa, CA
'11 PPV 9C3 Huron White

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