Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Buick > LeSabre
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools
Old 02-16-2016, 09:57 PM   #1
buicksuck123
AF Newbie
 
Join Date: Feb 2016
Location: asheville, North Carolina
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
97 lesabre cooling fans wont come on

My 97 lesabres cooling fans wont come on. the car gets pretty hot when driving around town. I saw on another form that they should come on when the Air Conditioning is on but mine does not. I got the fan to come on when connecting it directly to the battery so i know the fan is good. I replaced the high speed relay with the horn relay and still nothing.

Im not apposed to putting a switch in the cabin but im not sure the best way to go about doing that. Any help is appreciated.
buicksuck123 is offline   Reply With Quote
Old 02-17-2016, 09:48 AM   #2
brcidd
AF Enthusiast
 
brcidd's Avatar
 
Join Date: Jul 2005
Location: troy, Ohio
Posts: 2,313
Thanks: 2
Thanked 173 Times in 171 Posts
Re: 97 lesabre cooling fans wont come on

"Pretty Hot" Hmmmm-- to some that is boiling over- spewing coolant on the ground- to others that is needle on gauge just a hair above half (or normal).

I get this question all the time- "my fan(s) don't work! How do you know? The fan(s) are designed to come on when needed by the PCM. And there are numerous conditions that need to be met- it is actually a good thing- unlike the mechanical fans that consume horsepower when not needed. The fans need to be off when driving so as not to consume electric power and save energy and hp.

So here are some conditions- Engine temperature as seen by PCM (not dash) as 227 degf or so for fan1 (or low speed)- and about 237 degf for fan2 (or high speed)- unless you have a Tech II to watch engine temp and fan status, you cannot be certain if these conditions are being met.

I have tried with Tech II attached and had to let car idle for 45 minutes with a blanket over the hood and grille- to finally get engine temp up high enough to request fan1 on when it is 70 degf out!

Just because the temp on gauge on dash "is a little higher than normal" is no big deal-- In the red zone IS a big deal....

A/C operation will command the fan on constantly- only on particular car applications- yours being a GM "H" car means it will wait for a/c head pressure to reach 175 psi before fan activation-- so unless you are testing at 80 degf ambient with a/c on, chances are real good that the a/c pressure is not high enough (a/c evap load is low) and your variable stroke compressor is not generating enough head pressure by design (175 psi) to turn the fans on--because the ambient temp is too low.

Bottom line- I get more complaints where there is not a problem (like I suspect you are experiencing) then when there is.
__________________
Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
brcidd is offline   Reply With Quote
Old 02-17-2016, 07:43 PM   #3
polarzak
AF Regular
 
Join Date: Mar 2005
Location: New York, New York
Posts: 407
Thanks: 6
Thanked 7 Times in 7 Posts
Re: 97 lesabre cooling fans wont come on

Excellent reply, brcidd, very comprehensive.
Short story...my neighbour was complaining about his fans not working, and was monkeying around with them with the engine running. Nearly lost fingers when they suddenly started up. There even was a sticker saying fans can start any time.
polarzak is offline   Reply With Quote
Old 02-17-2016, 07:43 PM   #4
buicksuck123
AF Newbie
Thread starter
 
Join Date: Feb 2016
Location: asheville, North Carolina
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 97 lesabre cooling fans wont come on

i agree with that after doing some test with a paperclip in the coolant temp switch connection. I also did get both fans to come on when the dash got just over 200. So you are right i was being paranoid.
buicksuck123 is offline   Reply With Quote
Old 02-18-2016, 08:53 AM   #5
DeltaP
AF Enthusiast
 
Join Date: Oct 2011
Location: Ft Lauderdale, Florida
Posts: 953
Thanks: 13
Thanked 121 Times in 120 Posts
Re: 97 lesabre cooling fans wont come on

I don't think the horn relay is compatible with the high speed fan relay.
DeltaP is offline   Reply With Quote
Old 02-19-2016, 07:33 AM   #6
buicksuck123
AF Newbie
Thread starter
 
Join Date: Feb 2016
Location: asheville, North Carolina
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 97 lesabre cooling fans wont come on

delta p the horn relay had the same part number. That means it should be the same correct?
buicksuck123 is offline   Reply With Quote
Old 02-19-2016, 09:21 AM   #7
DeltaP
AF Enthusiast
 
Join Date: Oct 2011
Location: Ft Lauderdale, Florida
Posts: 953
Thanks: 13
Thanked 121 Times in 120 Posts
Re: 97 lesabre cooling fans wont come on

That's rare. OK I guess.
DeltaP is offline   Reply With Quote
Old 02-19-2016, 09:46 AM   #8
brcidd
AF Enthusiast
 
brcidd's Avatar
 
Join Date: Jul 2005
Location: troy, Ohio
Posts: 2,313
Thanks: 2
Thanked 173 Times in 171 Posts
Re: 97 lesabre cooling fans wont come on

A lot of car companies do that with relays- even though the horn uses only four terminals, they use the 5 terminal relay that is needed in the cooling fan circuit- just to maintain commonality- finally a nice feature for the owner presented by the manufacturer. Cuts down on assembly mistakes as well.
__________________
Automotive A/C Engineer with:
'99 IH 4700 Toy Hauler
(2) '95 GEO Prizms both maroon
'99 GMC Yukon
'95 Chev 3500, 454 Dually Crew Cab- 145k miles-
Wife's Camel trailer puller.
'94 Astro- 370k miles
'94 Firebird Formula- 5.7L 180k miles- gone-
'92 Chevy Lumina Van 3.8L 264k
'86 GMC S-15 - 2.8L 154k
'87 Buick Park Ave . 187k
'86 Buick Park Ave 3.8L 199k miles- gone
'77 Chevy Vega- 2.5L 175k miles gone but not forgotten
'68 Camaro 396 4 spd RS/SS -72k miles-
brcidd is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD


Tags
cooling , fans , lessabre
Go Back   Automotive Forums .com Car Chat > Buick > LeSabre

Thread Tools

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



All times are GMT -5. The time now is 01:41 AM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts