Do factory fans turn off on the highway?
Thread Starter
Joined: Dec 2005
Posts: 4,795
Likes: 15
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Do factory fans turn off on the highway?
Or are they simply tied to the on-off temps on the switches we have installed?
I'm just curious if my fans are running on the highway at 70 if my temp happens to be above my "on" temp for my switch (204 degrees currently). 204 on, 195 off is what I have installed currently.
I'm just curious if my fans are running on the highway at 70 if my temp happens to be above my "on" temp for my switch (204 degrees currently). 204 on, 195 off is what I have installed currently.
Joined: May 2014
Posts: 550
Likes: 6
From: Pittsburgh
Car: 91 G92 Z28
Engine: 305 TPI
Transmission: T5
Axle/Gears: 342
Re: Do factory fans turn off on the highway?
My 91 manual says for V8 vin F cars that the fan operates below 40 mph. But I think that is just the fan that operates from the ECU signal.
Thread Starter
Joined: Dec 2005
Posts: 4,795
Likes: 15
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Do factory fans turn off on the highway?
Well, for ECU cars, I could see that but I'm not sure if my cc Carbed 84 ECM has enough smarts to turn off my single fan or not since it doesn't otherwise control the fan that I know of outside of the fan switch turning it on and off based on the temp of the switch.
Joined: Sep 2005
Posts: 27,867
Likes: 2,429
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Do factory fans turn off on the highway?
Your carbed setup is strictly limited to the temp switch... road speed doesn't matter. It's quite dumb.
In practice though, if the A/C is off, it should virtually always be off at cruise speed.
In practice though, if the A/C is off, it should virtually always be off at cruise speed.
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