C5 cooling fans
Le Mans Master
Joined: Sep 2014
Posts: 5,278
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From: Kelowna BC
Le Mans Master
Joined: May 2006
Posts: 5,747
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From: Hillsboro Oregon
Repeating what 8VETTE7 posted long ago which was an instant find on Google
Post #2
https://www.corvetteforum.com/forums...y-come-on.html
If you have only one fan running then you have a problem that needs to be diagnosed. When the fans run both run at the same time at either high speed or low speed.
With the AC on the fans (both) come on at low speed at 185 degrees. They both go to high speed at 194 degrees.
With NO AC running the fans come on at low speed when the coolant reaches 226 degrees. The both go to high speed at 235 degrees.
When the vehicle speed reaches 35mph the fans go OFF no matter what the coolant temp is. Air flow through the radiator is better with the fans freewheeling than with them running.
Post #2
https://www.corvetteforum.com/forums...y-come-on.html
If you have only one fan running then you have a problem that needs to be diagnosed. When the fans run both run at the same time at either high speed or low speed.
With the AC on the fans (both) come on at low speed at 185 degrees. They both go to high speed at 194 degrees.
With NO AC running the fans come on at low speed when the coolant reaches 226 degrees. The both go to high speed at 235 degrees.
When the vehicle speed reaches 35mph the fans go OFF no matter what the coolant temp is. Air flow through the radiator is better with the fans freewheeling than with them running.
Last edited by jrprich; Nov 16, 2017 at 02:17 PM.
Thread Starter
3rd Gear
Joined: Nov 2017
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Le Mans Master
Joined: May 2006
Posts: 5,747
Likes: 224
From: Hillsboro Oregon
[QUOTE=bmmill;1595984562]would not let the temp get over 220 I see on other post have to let the temp go to 225-235 man that is high[/QUOTE
You will find that the C5 was actually designed by GM engineers to run hotter than many cars of the time. The C5's PCM is tuned for these higher temps.
http://www.corvetteactioncenter.com/...mperature.html
https://www.corvetteforum.com/forums...mperature.html
https://www.corvetteforum.com/forums...luctuates.html
You will find that the C5 was actually designed by GM engineers to run hotter than many cars of the time. The C5's PCM is tuned for these higher temps.
http://www.corvetteactioncenter.com/...mperature.html
https://www.corvetteforum.com/forums...mperature.html
https://www.corvetteforum.com/forums...luctuates.html
Acct Suspended APR 2026 by request
Joined: Dec 2010
Posts: 10,367
Likes: 1,272
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
you can have the fan settings reprogrammed to turn on sooner and make the car run right around 200 degrees all day long... this is standard practice if you ever have the car tuned but if you just want to have those settings changed a tuner shouldn't charge you much to do it, maybe $50
