95 Bonneville SSE fans not turning on - Page 5 - 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 06-03-2011, 03:45 PM   #41
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No one'* getting mad, just get the picture when you can. It'* just hard to give answers with limited information.
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Old 07-03-2011, 12:37 AM   #42
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Just to update and let everyone know I haven't solved the problem nor have I forgotten about the pictures. I just reread the entire topic and realized something that I must have missed. As you said there is only one sensor, I kept thinking there was two, but after I read it again I realized what you were saying. The car has still been getting hot and 2 days ago the check engine light came on. Could be unrelated but whatever. I can't afford those nice scanners unfortunately and the local GM dealership costs $80 + tax to have it scanned. Since I can't flash my own codes I'm slim on options. I think the sensor is new but I will replace it again and get back. Otherwise I'm down to installing a bypass switch that doesn't even use the sensor, it'll just use it'* own mounted sensor and turn the fans on at the setting I choose. I don't want to do this but I can't afford the cost of a blown engine. I was also advised to have a cooling system flush by a neighbor of mine who'* worked on these cars for a long time.
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Old 07-03-2011, 12:55 PM   #43
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I'm hoping this will help you guys to understand my confusion.
This is under the category Temperature switch: http://www.autozone.com/autozone/par...54_77401_8905_

and this is under coolant temperature sensor: http://www.autozone.com/autozone/par...er=146258_0_0_

Obviously the second one must go to my car since I'm able to look at it after entering my vehicle info. The one with the round plug has been replaced once already about 7 months ago maybe a bit more. But where does this oval plug sensor go? It looks similar to the camshaft position sensor that I replaced but it'* under the coolant temp sensor category?
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Old 08-08-2011, 11:39 AM   #44
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Sorry to update such an old discussion, but I've got some new information on this.

First I installed a 180 t-stat and managed to expel air from the system. So thanks to anyone who was trying to explain that to me as it was a big improvement. The car now stays at or barely below 200 degree while moving.

Now, the car still gets hot in stop and go and idle/park. That'* because the fan still aren't coming on. What I did find out, oddly enough, is that sometimes if the car does get up to temperature for the fans to come on (226 degrees) and I shut the car off but turn the key to the on position the fans do turn on until it cools off. But again I haven't noticed them turning on while the car is running or if they are they're turning on at way too high of a temp. The other odd thing I noticed is that the fans seem to either turn backwards or the blades were maybe installed backwards because the fans, when they do come on when I jump the wires, blow air out instead of sucking air into the engine compartment. I tried to install a bypass fan switch with adjustable temperature and it did work but it was making my car ding on the cluster panel. It was also flashing around the engine on my car info screen.

Any other ideas? I know I must be annoying by now but you're the only people who seem to know about these cars.
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Old 08-08-2011, 12:35 PM   #45
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did you replace the oval plug sensor?

if you get the polarity wrong on the fan motor it will spin backward

did you check the engine temp with an IR gun and scanner to verify the temps the computer is seeing are the right temps?
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Old 08-08-2011, 02:33 PM   #46
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You are not even close to being annoying.

Do the fans come on when you turn the A/C on? If you think the fans are running backward (blowing forward, not rearward) see if the electrical connections to the fans can be installed when turned 180*. The polarity may be reversed.
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Old 08-09-2011, 07:17 PM   #47
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The fans come on withthe a/c on. The reason I noticed the fan spinning backwards is because I jumped the positive and negative on the fan straight to the battery. I'm almost 100% sure I got the polarity correct. The engine is getting as hot as it says it is. That'* a fact. I also noticed that when I turn the key to the on position and the temp is past 226 both fans turn on until below that. But they both turn off. The low speed doesn't stay on. So it'* either they're both on with the a/c running. Or they're both on SOMETIMES when the car is off with the key in the on position
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Old 08-10-2011, 10:12 AM   #48
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Two suggestions.

First, check the relays for the low speed fan, and the high speed fan. I believe they have seperate relays. They are probably the same type of relay, so you can try switching them.

Second, in order to determine if the fans are indeed the problem, wire them direct to a 12V supply so they run all the time and take your car for a nice aggressive drive. If it still heats up, something other than the fans is the issue. Even if doing this makes your car run cooler, don't leave the fans hooked up like that. We are just doing this as a diagnostic step.
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Old 08-31-2011, 11:07 AM   #49
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Update! So I decided to randomly check the "brand new" temp sensor so all I did was use a paper clip to jump the plug terminals. The fans turned right on when I did that, as they should, so I just went out and got a new sensor. The fans turn on but when they do turn on the gauge reads 240 degrees they don't turn on any earlier than that. It may be 238 or so but it'* very close re the big line in between 200 and 280. My gauge must be reading accurate because as soon as it reads 180ish the t-stat opens so I guess what I'm saying is I don't understand why they turn on so high. Also they don't seem to have two speeds. They only BOTH turn on at about 240 and they dont seem to push a whole lot of air. I guess I've just heard other fans louder than mine
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Old 08-31-2011, 11:11 AM   #50
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The fans turn on around 226*, changing to a 180* thermostat will not change that set point.
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