cooling fan 2001 zo6
Thread Starter
Pro
Joined: Jan 2007
Posts: 646
Likes: 17
From: Hendersonville NC
cooling fan 2001 zo6
Cooling fan for engine fan not working unless AC is on then both fans work with the AC fan blowing more air. Any idea what could be wrong car has 27k miles on it and no mods.
Advanced
Joined: May 2016
Posts: 74
Likes: 9
From: Tennessee
What is your coolant temp? If I recall primary fan turns on at 230°, and secondary around 238°. I'm not a fan of it but these cars were set up to run pretty hot. When AC is on primary stays on, and if you idle up to 230 primary will kick on long enough to drop temps some. It will cycle on and off as temps rise and fall.
Melting Slicks
Joined: Sep 2008
Posts: 3,138
Likes: 802
From: Espanola New Mexico
On C5's both fans come on in low-speed mode when lower engine temp is reached, then both fans go to high-speed mode when the upper high temp is reached, and yes both fans come on when the AC is turned on. Your car may simply not be reaching the temp set points. The fans operation is controlled by the pcm which has an engine temp sensor as it's input and then powers the fan relays in a series configuration 'slow speed' or parallel configuration 'high speed'.
'
'
Drifting
Joined: Jul 2015
Posts: 1,844
Likes: 375
From: San Jose, CA
If you idle the car, does the coolant temp rise and rise and rise to infinity? Does it hit 210, 215, 220, 225, 230, 235F, etc, without anything happening? I would be willing to get it to about 235-240F before you shut your engine off, to test this out.
Or does it just get to (eg) 210F and you get cold feet and turn it off?
https://www.corvetteforum.com/forums...s-come-on.html
Or does it just get to (eg) 210F and you get cold feet and turn it off?
https://www.corvetteforum.com/forums...s-come-on.html
Safety Car
Joined: Mar 2005
Posts: 3,757
Likes: 1,215
From: Wisconsin
Here's the fan operation right from the factory service manual :
FSMFactory fan temp settings are low speed on at 226 degrees and off at 219 degrees. High speed on at
235 degrees and revert to low speed at 226 degrees. As stated both fans run at low speed and high
speed and fans are commanded off by the PCM when the vehicle speed exceeds 35mph.
You can force low speed operation at 185 degrees by turning on the AC. High speed operation with
AC on is still 235 degrees.
FSMFactory fan temp settings are low speed on at 226 degrees and off at 219 degrees. High speed on at
235 degrees and revert to low speed at 226 degrees. As stated both fans run at low speed and high
speed and fans are commanded off by the PCM when the vehicle speed exceeds 35mph.
You can force low speed operation at 185 degrees by turning on the AC. High speed operation with
AC on is still 235 degrees.
Racer
Joined: Apr 2017
Posts: 425
Likes: 94
My 2000 the A/C button comes on and flashes than goes off, no cold air comes out and can’t hear compressor click on. Haven’t messed with it mainly because it’s a top down car mostly and don’t want to spend the cash to have it looked.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski