95 Bonneville SSE fans not turning on - Page 3 - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 05-31-2011, 08:15 AM   #21
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

http://www.autozone.com/autozone/par...54_77401_8905_

i think this one would be the other one the one you put up says its the a/c press. switch. not like i havent seen there computers wrong but it seems pretty specific. this one says it feeds the dash gauge. and the one i posted before says it feeds the computer

did you check the temp with a IR gun to see if what you are looking at inside is valid?
jwfirebird is offline   Reply With Quote
Old 05-31-2011, 10:13 AM   #22
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2010
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
Kurisu_Sand is on a distinguished road
Default

I replaced the temperature sending unit when I put the new water pump on about 6 months ago. I also replaced a sensor that was located right next to the water pump, I dont remember what it was but I believe it was the other coolant temp sensor...

So this doesn't sound good.
Kurisu_Sand is offline   Reply With Quote
Old 05-31-2011, 10:15 AM   #23
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2010
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
Kurisu_Sand is on a distinguished road
Default

Sorry about these double posts guys.

Yes I did check it with an IR gun, I suppose I could do it again. But when the temp gets up to the 240 range it does seem to run differently, which leads me to believe that it is reading accurate. Of course it may not be.
Kurisu_Sand is offline   Reply With Quote
Old 06-01-2011, 07:31 AM   #24
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

http://i1142.photobucket.com/albums/...5bonniepcm.gif

it says e5 and f13 on your pcm, you could check to see you get the same at the sensor as at the pcm
jwfirebird is offline   Reply With Quote
Old 06-01-2011, 07:59 AM   #25
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

This thread is pretty confusing in places. Let'* clear some things up.

The low speed fans are programmed to turn on via pcm ground signal to relay at 216F, the high speed fans are programmed to turn on via pcm ground signal to relay at 228F.

The gauges in our cars are anything but accurate. I would trust the gauge to a degree, but get a scanner on it to double check. Confirm that it isn't running as hot as you think it appears.

There is one coolant sensor on the Series II 3800 that your NA 1995 SSE came with from the factory. The Series I 3800 and it'* 3800 predecessors typically had two sensors. In 1995 the SC 3800 was a Series I, which may have been part of the confusion on how many sensors.

The sensor in the radiator is a Coolant Level Sensor. Not a temperature sensor.

The stock thermostat is a 195F degree thermostat and is located under the lower intake manifold directly under the thermostat housing. But on the exterior of the LIM next to the exhaust crossover pipe. The thermostat is located under the thermostat housing where the top radiator hose meets the engine.

The Series II 3800 Coolant Temp Sensor is a two sensors in one unit. There are three wires to it, one to provide ground (IIRC it'* ground and not 5+) and the other two are outgoing feeds. One feeds the temp to the pcm and the other to the dashboard gauge.

If your fans come on with the AC that means the high speed relay is working. If they do come on at 216F-220F on low speed, I would start by checking/replacing the low speed fan relay.
BillBoost37 is offline   Reply With Quote
Old 06-01-2011, 11:47 AM   #26
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2010
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
Kurisu_Sand is on a distinguished road
Default

Here'* everything I know.
Both fans come on when the AC turned on. Which means the relays are working.
I've replaced the temp sending unit which is a circular connector located under the thermostat housing
I've replaced another coolant temp sensor that was located right next
to the water pump.
I've let the car sit idle to 240ish and the fans DO NOT come on
The symptoms I get while driving the car are:
The temp gauge will climb to 240 and stay there or go higher in stop
And go traffic. While driving it will get to that temp and then shoot down to 200-215ish.
During high temps it seems the car struggles compared to times when the car reads ~200

Something i thought was weird was as soon as I start pressing the breaks the temp gauge starts rising. Which I thought was odd, almost as if it'* programmed to go up with break application. I know this isn't right so I also thought it may be a possible PCM problem. I had my computer scanned and there supposedly was an internal PCM problem. But you never know with these dealerships...
Kurisu_Sand is offline   Reply With Quote
Old 06-01-2011, 12:10 PM   #27
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

The fans may work, but turning on the AC and both fans coming on only proves that the high speed fans are working. It does not mean the low speed relay is working.

The brake and temp gauge fluctuation has nothing to do with the pcm. The temperature is sent directly from the the one and only sensor under the tstat housing directly to the gauge. By getting the fluctuation you mention, I'd say it'* time we suggest you clean the ground busses by the door sill plates. There is obviously something electrical happening here.

There is no second sensor by the water pump, radiator or anywhere else on your 95 NA motor. There is only one. I don't know what it was that you swapped, but it'* not a coolant temp sensor. If you could take a picture of it, we can identify it for you.

Your best bet is to have the car scanned for temperature and see what the pcm reading is saying. It'* pretty common for the gauge clusters in our cars to be inaccurate.
BillBoost37 is offline   Reply With Quote
Old 06-01-2011, 03:04 PM   #28
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2010
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
Kurisu_Sand is on a distinguished road
Default

Something I forgot to mention.
Before I purchased the r the engine was replaced with another series 2.

Ive considered a ground issue. But is it wrong for me to suggest that my flaky OBD1.5 computer could be causing such things?

You mentioned the relays. If the high speed was working then shouldn't it come on during temps around 230+?
Kurisu_Sand is offline   Reply With Quote
Old 06-02-2011, 08:10 AM   #29
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Sure it should have come on when the car hit 230F. However when you say that your gauge moves when you press the brakes, that'* another symptom that leads me more toward an electrical issue more than a mechanical problem. This is why I suggest scanning the car. No one dislikes the 95 pcm, but I've gotten a pretty good feel for when it'* the pcm and when it'* not. So far.. my gut says scanning may show you that the cluster is incorrect.

These clusters are also known for problems. I've had mine apart many times and am about to pull it apart again because the oil pressure isn't what it says...and voltage ain't no 18volts according to my multimeter. Just something to keep in mind...the cluster could be lying. My 95.. it read 240F when the low speed fans kicked on. I used a scanner and found out that the gauges were lying to me.
BillBoost37 is offline   Reply With Quote
Old 06-02-2011, 11:15 AM   #30
Member
Posts like a V-Tak
Thread Starter
 
Join Date: May 2010
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
Kurisu_Sand is on a distinguished road
Default

Alright I'll have it scanned and get back to you. It just seems like the car runs a little odd whenthe gauge reads high.
Kurisu_Sand is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Electric Fans not turning on Paul_Berke 1992-1999 3 04-14-2010 09:35 AM
97 SSE Cooling Fans Not Coming On gmlvr39 Everything Electrical & Electronic 7 07-16-2009 12:08 PM
1997 Bonneville SSE Squeaks When Turning kc27 1992-1999 4 01-04-2009 01:01 AM
OUTKAST FANS!! (Charlie Brown fans too) bonnie94ssei Lounge 9 02-01-2004 09:39 AM
Solved: Front-End Crunch When Turning Left in '92 SSE compyelc4 1992-1999 0 04-25-2003 01:48 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:51 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.