81 electric fan
Thread Starter
Racer
Joined: Jul 2012
Posts: 420
Likes: 3
From: deposit new york
81 electric fan
I don't think mine is working, does anyone what triggers it how I can test it, I unplugged it and tested the fan itself to make sure it works, and it does just fine off of a 12v source, but I have never seen it kick in and I noticed the other day she was running a little hot, I remember someone saying the ground on the back of the passengers side head is part of it, and that ground is missing on mine, the bolt is there but I cant find any wire that should go to it. thanks 
Thread Starter
Racer
Joined: Jul 2012
Posts: 420
Likes: 3
From: deposit new york
mine usually runs about 185 or so, the other day I was using the ac, which I just swapped out compressors and climbing a big hill and I noticed it went up to 200 a little above. I have never seen it get that hot before, which made me think my ac swap might not have been a good idea or just my aux electric wasn't coming on like it should. but I climb the same hill 4 times a week for work, and even with the ac off its still getting up to 200, so my ac wasn't the issue, maybe I just never noticed it on that hill before lol
Melting Slicks
Joined: Oct 2006
Posts: 2,417
Likes: 336
From: Texas
a little more info: temp activation 238
http://jerome.laurent6.free.fr/Sch%E...ling%20fan.jpg
http://jerome.laurent6.free.fr/Sch%E...ling%20fan.jpg
Last edited by speedreed8; May 19, 2014 at 08:30 AM.
Le Mans Master
Joined: May 2007
Posts: 5,021
Likes: 1,120
From: North tonawanda NY
Yes and the fans don't kick in till it reaches over 225.. mine came on at 228 until I put a lower temp fan temp sensor in....( mine failed twice in 13 years btw) I believe the first poster had it right that GM used a 225-230 temp relay during these years for some reason.
Last edited by augiedoggy; May 19, 2014 at 08:28 AM.
Le Mans Master
Joined: Aug 2010
Posts: 5,339
Likes: 546
From: Central Texas
According to the link that speedreed8 posted the fan doesn't kick on until 238 degrees F. That was unacceptable to me. I replaced the sending unit with one that kicks that fan on earlier. You can get them in different temperatures depending on your needs. Summit Racing is where I got mine.
http://www.summitracing.com/search/p...rder=Ascending
http://www.summitracing.com/search/p...rder=Ascending
Last edited by Street Rat; May 19, 2014 at 08:35 AM. Reason: Add link
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Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
There's a heavy gauge plug in front of the starter. You can pull it and use a jumper wire in the plug to turn the fan on but everyone is correct, that sucker doesn't turn on until it's just about ready to boil 235*!!!
Some of the venders sell the lower thermostat switch that screws into the side of the block. Then just plug the heavy gauge plug into it. I think their turn on temp is 195*
Some of the venders sell the lower thermostat switch that screws into the side of the block. Then just plug the heavy gauge plug into it. I think their turn on temp is 195*
Thread Starter
Racer
Joined: Jul 2012
Posts: 420
Likes: 3
From: deposit new york
when I put on the side pipes last year, the plastic clip that holds the wires on the thermostat cracked, didn't think much of it then, but today I took the wires out of the clip and tightened the connections and done away with the clip and plugged them in and now its like a keyed switch comes on every time she runs, didn't realize this until I went for a drive and came back and herd the fan running, never herd it run before, I like this option much better, until I pick up a lower rated thermostat switch.
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,481
From: Southbound
Cruise-In II Veteran
Pro
Joined: Aug 2013
Posts: 591
Likes: 3
From: Monroe Washington
Chris... When I was trying to test that switch I accidentally grounded the two together with the alligator clip of my test light... It too came on with a turn of the key... At least I know it works... But your situation may not 'Stay' on if it's just arcing or touching the two connectors... But, those two wires touching at that temp sending unit is causing what you describe. ;-)
Thread Starter
Racer
Joined: Jul 2012
Posts: 420
Likes: 3
From: deposit new york
they are not arching, but maybe when I tested them it stuck open, and will shut off when it gets up to temp. I will keep an eye on it until I find a new one.
just insulated the connections, and it must have jumping, darnit
just insulated the connections, and it must have jumping, darnit
Last edited by chrisNY; May 19, 2014 at 04:45 PM.