cooling 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 03-08-2007, 12:46 AM   #1
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cooling fans not turning on ?????? changed sensor but nothing any help ??/

95 bonny SE

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Old 03-08-2007, 12:51 AM   #2
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Please put '95 SE' in your signature by editing your profile so we know what you have in future posts.

Not coming on WHEN? They shouldn't come on until over 200 degrees.

When you turn on your AC, do they come on (both high speed)?
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Old 03-08-2007, 07:35 AM   #3
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Being that we don't know where you live.. or when you expect the fans to come on.. I get to have fun here.

Your fans don't need to come on at the south pole. It'* -110F degrees

Seriously though. The fans come on at about 215F for low speed and 225ish for high speed. Using a scan tool, you may find that your gauge is inaccurate and the fans do or don't kick on appropriately. The relay connections could also be suspect.
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Old 03-08-2007, 01:09 PM   #4
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THANK'* FOR ALL OF THE HELP.

BUT THEIR NOT COMMING ON AT ALL, I DID FORGET TO MENTION THAT I JUST CHANGE THE A/C COMPRESSURE BUT HAVE NOT HAD IT CHARGE UP YET.

DO YOU KNOW WHICH RELAY IT IS FOR THE FANS IS IT ONE ON THE FIRE WALL OR SOME WERE ELSE???


THANK'*
STEVEN
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Old 03-08-2007, 01:53 PM   #5
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Steven..

Please don't use caps. It is viewed as yelling as while we know you are happy for the replies...

Ok, where do you live? What temperature is the motor getting to? Have you used a scan too to verify the temperature reading of the dash gauge?
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Old 03-08-2007, 02:05 PM   #6
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sorry for the cap'* but at work our systemmust be in cap'* so I don't change it, sorry

I live in san jose ca, temp will hit 280 + if i don't do something about it. have never used a scan tool to verify the temp. but I kow it get very hot !!!! i have put powe to the fan'* and they do spin.

steven
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Old 03-08-2007, 02:18 PM   #7
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You are sure the temp is warm enough, but they don't come on..

Have you checked/tested the relay for the fans? We have found that the contacts usually need a cleaning. Check power to the relay and that the relay functions. If the relay is good and connection is good, then the next item to check would be the coolant sensor that feeds the PCM to turn on the fans. (I believe you said you already changed that though)
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Old 03-08-2007, 10:26 PM   #8
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]Have not tested he relay because I don't know which one it is.... Help....... and the PMC what is that? and could that be bad or go bad ???? and yes they don't go on at all. At one time the temp gage was pegded all the way over and they never came on.
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Old 03-08-2007, 10:53 PM   #9
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Desperation won't help.

You haven't answered all the questions.

We need to know:

1. Where you live. The climate and average temps are important.
2. Do you have a scantool?
3. Do the fans come on when you turn the air conditioning on?

There'* alot more to this than you may think, and we need this information to help you. Your temperature sender may not be working right, making you think you are running hotter than you are. The gauge uses a dedicated sensor, while th PCM (powertrain control module or COMPUTER) uses another. The COMPUTER tells the fans when to come one, and could care less what the gauge actually reads. It has it'* own dedicated sensor.

Please answer the 3 questions above.
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Old 03-09-2007, 01:24 AM   #10
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I did answer those questions in the in the second or third post once again I live in San Jose California, average temp in the summer 90. I do not have a scan tool and I just put in a new a/c compressor but have not charge it back up. Fans do not come at all at any temp.
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