cooling fan wont shutoff, ignition off - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-23-2007, 04:02 AM   #1
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Default cooling fan wont shutoff, ignition off

Hi , Have a 96 with NA motor. The cooling fans wont shut off . Had to disconnect battery to keep it from going dead. I reconnected it after a minute and it worked normally for a couple trips then reoccured. I saw a previous post about looking for broken wires from temp sensor to PCM. Any other likely causes? Do you think a sticking relay could cause this? Thanks, Dave
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Old 04-23-2007, 07:48 AM   #2
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Hi Dave..and welcome to the club.

I would personally aim straight to the relay. Replace/check the relay and let us know what you find.
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Old 04-23-2007, 11:38 AM   #3
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Thanks Bill , I just picked up relays. It has 2 right? I will update with results. Dave
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Old 04-23-2007, 02:09 PM   #4
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IIRC the low speed is one relay..and high speed is another. If you replace and that does not solve the issue...probe for ground coming into the relay. It could be that the wire is shorted or something is bad before that..however our experience is relay.
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Old 04-23-2007, 02:29 PM   #5
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i know my fans stayed running all the time and i noticed the temp gauge was not functioning. turned out.....the temp wire was not hooked up. try checkin that if u haven't.
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Old 04-23-2007, 09:31 PM   #6
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Thanks guys, Today I shotgunned 2 relays and the temp sensor at it. My GF drives this car and shes usually on the other side of houston with it 50 mi from me, so hopefully this will take care of it. Thanks and I will update in a couple days, Dave
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Old 04-24-2007, 08:43 AM   #7
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You all will love this: I was going on info from GF that the car was intermittently having the fan not shutting off. So I swap vehicles with her and (fix it ) Tell her what I did and she says no not that. Its the FAN not shutting off. She says the inside fan! Doh!. Dave
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Old 04-24-2007, 09:02 AM   #8
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LOL...Love it Dave.

Did you reach over and turn the switch to off?
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Old 04-24-2007, 11:03 AM   #9
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Well, Did a search for blower motor problems and looks like maybe blower motor control module can cause the fan to stay on even with the car off. Im gonna take a look at that. Dave
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Old 04-29-2007, 01:45 AM   #10
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Fixed the stuck on high Inside blower with a new blower control unit. Was $110.00 from a local parts place that does mostly wholesale and carrys acdelco. Oreilly and Azone dont carry it. Part is on the front of the firewall under the relay panel. Remove the 10mm bolts holding the relay panel to the firewall and you can pull the panel forward far enough to get at the blower contro unit. Prettty easy. Dave
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