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.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-06-2007, 07:07 AM   #1
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Mar 2007
Location: portland
Posts: 149
Thanks: 0
Thanked 0 Times in 0 Posts
SPOILEDRED94 is on a distinguished road
Default cooling fans

Having A Fan Problem: Fans Come On, Temp Stays About 180, Drive Awhile And Dashboard Gauge Jumps To 220 Ish... Check Fans And They Are Off. Drive Awhile More And Temp May Drop As Fans Come On Again. Am I to understand the pcm turns them on off as ect Sensor dicates? Any Help Appreciated! Kris
SPOILEDRED94 is offline   Reply With Quote
Old 09-06-2007, 09:54 AM   #2
Senior Member
True Car Nut
 
Join Date: Feb 2006
Location: Somewhere different on the globe every month....
Posts: 2,896
Thanks: 0
Thanked 0 Times in 0 Posts
Cheetah is on a distinguished road
Default

I am assuming that you have a 180F thermostat?

To answer your quetsion, it is "Yes."
Cheetah is offline   Reply With Quote
Old 09-06-2007, 10:28 AM   #3
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

Low speed fans are commanded on at ~216F, high speed is commanded on ~228F.

Seems like proper operation to me. That'* leaving out the part that any speed above ~40mph they turn off as the airflow should be moving faster than the fans.
BillBoost37 is offline   Reply With Quote
Old 09-06-2007, 11:34 AM   #4
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Mar 2007
Location: portland
Posts: 149
Thanks: 0
Thanked 0 Times in 0 Posts
SPOILEDRED94 is on a distinguished road
Default cooling fans

Thank You Cheetah. I Thought Perhaps There Was A Temperature Controlled Switch Up By The Fans Controlling Them. And Yes I Do Have A 180 T Stat With One 1/4 in Hole In The Flange. Should There Be More Or Bigger Holes? Bill: Thank You Too. I Figured They Were Not On When They Should Be. I Take It Everything In The Fan Dpt. Is As It Should Be Then? It Seems My Temps Used To Be Steady At Just Below 200. If Every Thing Is Now As It Should Be Is It Desirable And Possible To Keep My Temps Down To At Or Near 180?
SPOILEDRED94 is offline   Reply With Quote
Old 09-06-2007, 12:39 PM   #5
Member
Posts like a V-Tak
 
Join Date: Sep 2007
Location: Lebanon, MO
Posts: 84
Thanks: 0
Thanked 0 Times in 0 Posts
kjhansen57 is on a distinguished road
Default High speed fan switch

You should be able to force the high speed fan to come on by putting a switch on the ground side of the high speed fan relay. The switch will ground the high speed fan relay regardless of engine temperature. To install, run a wire from a ground location to one end of the switch and run another wire from the other end of the switch to the wire going from the High Speed relay to the temperature switch connector. You can splice into the wire at any point. I'm not familiar with the wire colors or relay locations on the Pontiac, but if you have a wiring diagram you should be able to figure it out. Put the switch somewhere in the cab easy to find. Don't forget to turn it off when you kill the engine.
kjhansen57 is offline   Reply With Quote
Old 09-06-2007, 01:17 PM   #6
Senior Member
True Car Nut
 
Join Date: Feb 2006
Location: Somewhere different on the globe every month....
Posts: 2,896
Thanks: 0
Thanked 0 Times in 0 Posts
Cheetah is on a distinguished road
Default

I would not worry about testing the hi speed mode. I have had my car for 4 years, and of that I lived in Georgia for 2 years. Letting the car sit in 100-105F with the A/C on for a considerable amount of time, the H/* mode never kicked. Those 2 fans do a GOOD job pulling air on low speed. IMO, there is no need to splice anything.

For the holes in the thermostat, depends on what you do with you car and where you live. Use the search feature, you will pull up A LOT of articles on it I looked into doing it, but I live in Alaska and it'* not needed in -19F as a daytime high
Cheetah is offline   Reply With Quote
Old 09-06-2007, 01:28 PM   #7
Member
Posts like a V-Tak
 
Join Date: Mar 2007
Posts: 48
Thanks: 0
Thanked 0 Times in 0 Posts
Luke is on a distinguished road
Default Independent 'Manual' Radiator Fan Switch.

Quote:
Fm > KJ Hansen
You should be able to force the high speed fan to come on by putting a switch on the ground side of the high speed fan relay.

The switch will ground the high speed fan relay, regardless of engine temperature.

To install, run a wire from a ground location to one end of the switch,
and run another wire from the other end of the switch to the wire going from the High Speed relay
Although, I've not done this yet to my wife'* '97 LeSabre, I've done it to my '95 Saturn, and would not be without it. I placed my switch on the upper dash to the left of the steering wheel. It comes in very handy, particularly when driving through the Los Angeles Freeway traffic, which is basically stop & go.

It'* turned out to be invaluable to me, while my Saturn now has 506,794 miles on it. And I'm the original owner.

I should note, such an installation does not change any of the other computer controlled radiator fan activation inputs.
It is simply an added way the fan can be turned on.
Luke is offline   Reply With Quote
Old 09-07-2007, 04:12 AM   #8
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Mar 2007
Location: portland
Posts: 149
Thanks: 0
Thanked 0 Times in 0 Posts
SPOILEDRED94 is on a distinguished road
Default cooling fans

Guys, I Am Weigh Happy 4 Your Input, Really. I Have Everything To Do The Overide Switch This Sunday. That Is With The Help Of Your Very Specific Info! Still I Dont Like Overiding My Pcm. Why Does The Pcm Allow Such A Large Up Swing In Temp Anyway? Minus 19 Dude? Havent You Heard Of Condo Time Shares In FLA ? ha ha . laughing Kris
SPOILEDRED94 is offline   Reply With Quote
Old 09-07-2007, 12:57 PM   #9
Member
Posts like a V-Tak
 
Join Date: Mar 2007
Posts: 48
Thanks: 0
Thanked 0 Times in 0 Posts
Luke is on a distinguished road
Default Manual Radiator Fan activating switch

Quote:
Fm > Kris > Spoiledred 94
Still I Don't Like Overriding My Pcm
I should stress, the insertion of a manual switch, simple is an additional & independent way the fan can be activated.
None of the other activating fan controllers is affected, no overridden.
It is simply and additional means by which the fan can be activated, and at a point the driver wants.
Luke is offline   Reply With Quote
Old 09-07-2007, 01:05 PM   #10
Senior Member
True Car Nut
 
Join Date: Feb 2005
Location: Brampton, Ontario
Posts: 3,014
Thanks: 0
Thanked 0 Times in 0 Posts
Maymybonnieliveforevr is on a distinguished road
Default

Quote:
Originally Posted by BillBoost37
Low speed fans are commanded on at ~216F, high speed is commanded on ~228F.
Now ya see, to me that really doesn't make sense. by the time the engine coolant temperature reaches ~228F it'* already starting to get to hot for me. In my opinion, the high speed fan should come on at around ~216F.

By the way, Will did an amazing write up in one of my thread on how to install an over ride switch to the pcm. I did it myself and have been using that switch on a regualar basis. Well Mick has anyway.
Maymybonnieliveforevr is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Cooling fans never come on accept... WendysGirl 1992-1999 5 02-26-2004 02:41 PM
Cooling Fans for 97 Bonneville mvh_2000 1992-1999 5 09-24-2003 12:13 PM
Running Temperature/ Cooling Fans Boberle1150 1992-1999 10 08-25-2003 12:01 AM
Cooling Fans Jim W 1987-1991 8 08-05-2003 11:00 PM
How many cooling fans is my car supposed to have? egladman 1987-1991 24 06-26-2003 02:23 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 02:23 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.