collant fans - 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 09-01-2007, 10:14 PM   #1
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the fans on the 94 are not coming on replaced the relays coolant temp sensor and now i'm kinda lost the car has started to idle up and down aswell checked all the vac lines and we are good there it will some times idel at 2000 rpm and other times 700 also started to run rough

the fans work like normal with the ac going thank good ness for that have high and low speed and turn to high speed at the proper temp like nothing is wrong i am starting to lean toward pcm but need you alls opinion thanks
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Old 09-03-2007, 06:03 PM   #2
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no clue ?
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Old 09-03-2007, 06:36 PM   #3
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When you replaced the coolant sensor. Where was it located. There are two.
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Old 09-03-2007, 06:37 PM   #4
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the one under the TB the other one works the dash guage
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Old 09-03-2007, 06:41 PM   #5
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FYI, your post is real hard to read without proper punctuation
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Old 09-03-2007, 07:06 PM   #6
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ya i know that is my weak point but i still get the idea across and i'm not going to go in to


a whole feel sorry for me cause i'm stupid thing but i will say that i never seen the inside of a school since 5th grade so some things are just not clicking in my head for things like this back to the issue at hand

i am going to go out and swap the sensor leads in a sec and see if it gets the fans that way for now
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Old 09-04-2007, 12:16 AM   #7
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well it is a no go that way either so back to square 1
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Old 09-04-2007, 09:42 AM   #8
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Have you tested for power going into the fan relay to ensure there is power to be relayed to the fans?
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Old 09-04-2007, 11:09 AM   #9
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well i can kill the fans when they are on with the AC by pulling the relays so i kinda ruled the no power option out
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Old 09-04-2007, 11:59 AM   #10
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Ok.. Good.

We know we have power.
Do we know the temp gauge is accurate? My 95 was consistent...not accurate. The dash would say 240 when the pcm temp was 212. That'* a far cry from a happy situtation. However if you are looking for fan turn on too early, it'* a possibility.

Next up is looking for the fan request. The ground going to the relay is the trigger for the fans. When the pcm wants fans, that wire is grounded. Check for ground when you know the fans should be on. If you get no ground..then it may be a pcm. Not a typical failure though.
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