95 Bonneville SSE fans not turning on - Page 2 - 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 05-28-2011, 12:42 AM   #11
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Here is some more things to check!
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Old 05-28-2011, 03:55 AM   #12
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Alright, I can't seem to make out where they are with the first diagram but the second kinda helps. Also is this drastic fluctuation in temperature normal? sometimes it operates anywhere from 240-250ish to 200 degrees. It just seems like it'* supposed to stay fairly steady.

I realize that this could be a result of the fans not turning on.
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Old 05-28-2011, 08:57 AM   #13
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normal operation is steady temp, but if your fan isnt coming on its just going to go high when your not moving enough to cool the rad.

also alot of people forget the rad is like an a/c condenser you have to clean the crap bugs, dirt, sand, whatever out of the fins once and a while. you should be able to shine a light from the back and see light through the fins
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Old 05-28-2011, 08:57 AM   #14
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240-250 is a lil high have you ever done a coolant flush? If you open the cap do you have good coolant flow?
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Old 05-28-2011, 09:31 AM   #15
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Those temps are high. Your thermostat is a 195*, so you should hold about 200* or so. However, with that being said. The fans not coming on will cause it to over heat when not moving. The fans are set to come on around 226*. You have already confirmed the fans work by turning on the AC. So the fans, relays, and fuses are good. Which brings me once again back to the coolant temp sensor.
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Old 05-28-2011, 03:28 PM   #16
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I believe you're right DANTHURS. Yes, I installed a new water pump and when that happened I put in all new coolant. I left the cap off after the installation and observed that at the right temperature a flow began to happen. So I think everything there is OK. By flow I mean the coolant level in the radiator went down.
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Old 05-30-2011, 04:29 PM   #17
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I've found the second temperature sensor but the sensor I purchased is the one that goes into the engine block. Does anyone have a part number from auto zone or the like for the sensor that fits into the coolant in-line slot? The plug is even a bit different in the front one.
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Old 05-30-2011, 09:22 PM   #18
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http://www.autozone.com/autozone/par...er=146258_0_0_


looks like they call one temp switch and one temp sender. i think the sender is what you need, in the description it says the signal sent to pcm
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Old 05-30-2011, 11:23 PM   #19
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The one in that link is the one I bought and it does not fit the sensor that is attached to the coolant line. That one is the sensor that goes on the engine block.

What'* the possibility that the problem is computer related?

Also I was driving today and it actually got up to 240 while I was driving, not when I was stopped. It does often go up in temp while driving and as soon as I touch the brakes it starts to climb.

Maybe I'm worrying too much but I just don't want this to be a blown head gasket, or something else expensive.
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Old 05-30-2011, 11:24 PM   #20
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This is actually the sensor that I found on the car that was in-line with one of the radiator pipes.

http://www.autozone.com/autozone/par.../N-j1npzZ91shf
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