Fan Help
Thread Starter
Instructor
Joined: May 2004
Posts: 184
Likes: 0
From: San Francisco Ca
Fan Help
I've got two things...first is that I don't think my fan is coming on at all unless I have the air conditioner running. I have gotten out of my car and opened the hood when my temp reads over 200 and i can't tell that either of the fans are on. Any ideas on how to fix this? Also in the same idea, how do i rewire (or reprogram) the fans to turn on at lower temperatures?
Team Owner
Joined: Jan 2003
Posts: 20,293
Likes: 240
From: Summerland B.C. Canada
You will have to get it hotter than that if you want to see the fans run, around 228. A custom chip can lower fan start temp or you can buy a lower aux fan switch and tie it into relays.
Melting Slicks
Joined: May 2004
Posts: 2,524
Likes: 10
From: Lufkin Texas
St. Jude Donor '05-'06
Yep, agent86 is correct, fans are not coming on at 200 without help from a manual switch or a custom chip.
Here's a tech tip that I wrote that is mainly on testing the relays but also touches on wiring a manual fan switch and should help you understand the fans/relays a bit better.
https://www.corvetteforum.com/techti...=282&TopicID=2
Here's a tech tip that I wrote that is mainly on testing the relays but also touches on wiring a manual fan switch and should help you understand the fans/relays a bit better.
https://www.corvetteforum.com/techti...=282&TopicID=2
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
For your year, fans are controlled by the a/c pressure switch - they should both be on if the a/c is on; or the engine coolant temp switch signal to the PCM. That will turn the primary fan on at 219 - off at 208; and the secondary fan on at 228 - off at 217. These temps won't hurt your engine. If you're operating outside of these parameters, best to use a scanner first so that you can compare the gage reading with ECT signal. Otherwise, there is a basic cooling system problem - restricted air flow, plugged coolant passages, etc.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
The General designed our L98s to run in the 200-230 deg F range to meet emission stds. So the T-stat works around 195-200deg F and fans come on later.
If you want to lower engine temps, install a 180 deg or 160 deg T-stat and complimentary fan switch.
If you want to test your fan operation, simply open the connector to the A/C pressure switch or jumper ALDL pins A&B (upper right) and start the engine. At least the main fan should come on.
Intermediate
Joined: Jun 2004
Posts: 35
Likes: 0
From: Soulsbyville CA
LoL. I had the same problem with my 84. Fan took a crap. (So i thought)
you know its not the fans cuase they turn on when ac is on. do what 85vette said. get a manual fan switch. there easy. if i remember right. It's( switch-pos battery)(switch-cooling fan).you probably already know this but im trying to help. lol.
P.S.-the real problem about a manuall fan is REMEMBERING TO TURN IT OFF!!!!! Its grounds for a dead battery.lol.
zach-
you know its not the fans cuase they turn on when ac is on. do what 85vette said. get a manual fan switch. there easy. if i remember right. It's( switch-pos battery)(switch-cooling fan).you probably already know this but im trying to help. lol.
P.S.-the real problem about a manuall fan is REMEMBERING TO TURN IT OFF!!!!! Its grounds for a dead battery.lol.
zach-
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Drifting
Joined: Aug 2004
Posts: 1,448
Likes: 1
From: Tracy CA
Originally Posted by 65Z01
The General designed our L98s to run in the 200-230 deg F range to meet emission stds. So the T-stat works around 195-200deg F and fans come on later.
?I'm still getting used to how hot these engines were designed to run at.