Cooling fan problem
Thread Starter
Navigator
Joined: Nov 2015
Posts: 9
Likes: 0
From: Monterrey
Cooling fan problem
Hi everyone i'm new around here, i've searched all around the forum to see if anyone have the same probelm that i have. I have a 91 Corvette L98 and my problem is that my cooling fans only turns on when i turn on the A/C, but if don't turn on the A/C the fans doesn't work :confused:
(my vette has 2 fans, one is in the upper left side and the other one is in the low right side, both on the same side of the radiator)
i hope you can help me to find out what could it be
(my vette has 2 fans, one is in the upper left side and the other one is in the low right side, both on the same side of the radiator)
i hope you can help me to find out what could it be
Team Owner
Joined: Sep 2003
Posts: 25,366
Likes: 2,733
Hi everyone i'm new around here, i've searched all around the forum to see if anyone have the same probelm that i have. I have a 91 Corvette L98 and my problem is that my cooling fans only turns on when i turn on the A/C, but if don't turn on the A/C the fans doesn't work 
(my vette has 2 fans, one is in the upper left side and the other one is in the low right side, both on the same side of the radiator)
i hope you can help me to find out what could it be
(my vette has 2 fans, one is in the upper left side and the other one is in the low right side, both on the same side of the radiator)
i hope you can help me to find out what could it be
Last edited by WVZR-1; Nov 27, 2015 at 04:51 PM.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Is it possible that your coolant never got hot enough (greater than 228°) to cause the fan to come on? The second one comes on at 238°...
Last edited by Cliff Harris; Nov 27, 2015 at 11:37 PM.
Thread Starter
Navigator
Joined: Nov 2015
Posts: 9
Likes: 0
From: Monterrey
Hi, well i think that's not the problem because the temperature raises without a problem, i did a test sometime ago i started the engine and let the temperature raise and almost hit the mark of overheat and the fans didn't go on
Race Director
Joined: Oct 2005
Posts: 11,769
Likes: 175
From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
I only ask because the Corvette analog temp gauges do not have a linear scale.
It is very hard to tell exactly what the actual temp reading is.
Does the '91 have a digital temp gauge?
If so, what temp is being displayed?
Cruising
Joined: Nov 2015
Posts: 11
Likes: 0
Hi everyone i'm new around here, i've searched all around the forum to see if anyone have the same probelm that i have. I have a 91 Corvette L98 and my problem is that my cooling fans only turns on when i turn on the A/C, but if don't turn on the A/C the fans doesn't work
(my vette has 2 fans, one is in the upper left side and the other one is in the low right side, both on the same side of the radiator)
i hope you can help me to find out what could it be
(my vette has 2 fans, one is in the upper left side and the other one is in the low right side, both on the same side of the radiator)
i hope you can help me to find out what could it be
Car never gets hot now and it can sit in traffic jams on hot days and never over heats.
Instructor
Joined: Apr 2010
Posts: 216
Likes: 8
I also added a manual fan control override switch in the cabin. I bought the kit from Ecklers I think it was. You can buy the switch, wires, etc separately - but I like the idea of buying the kit with everything I needed, pre-cut lengths of wire, etc. While installing it I also cleaned out the junk from between the radiator & shroud.
Also I saved this idea from CF member C422 - - it works on my '91 so you should try it:
Your AC unit actually has the ability to tell you what the coolant temperature is as well. NOTE: it's in Celsius! (to convert to Fahrenheit, multiply by 1.8 and add 32)
Steps to check: hold the fan up and fan down arrows until "00" is displayed on the AC temperature display. Press the center fan button. Scroll to "16." Press the center fan button again. There's your temperature, digitally, and more accurately than the analog gauge.
Read more: https://www.corvetteforum.com/forums...#ixzz3t4SXF0D4
Also I saved this idea from CF member C422 - - it works on my '91 so you should try it:
Your AC unit actually has the ability to tell you what the coolant temperature is as well. NOTE: it's in Celsius! (to convert to Fahrenheit, multiply by 1.8 and add 32)
Steps to check: hold the fan up and fan down arrows until "00" is displayed on the AC temperature display. Press the center fan button. Scroll to "16." Press the center fan button again. There's your temperature, digitally, and more accurately than the analog gauge.
Read more: https://www.corvetteforum.com/forums...#ixzz3t4SXF0D4
Instructor
Joined: Jan 2013
Posts: 128
Likes: 26
I had both fan motors simply worn out. They would turn on most of the time but not always. Replaced both relays and motors, works fine now. Though the engine does get uncomfortably hot at least by the analog needle. Cooler thermostat and new sensors are on the to-do list this winter.
One fan had also blown it's fusible link (behind the battery) when a small rock had prevented rotation.
One fan had also blown it's fusible link (behind the battery) when a small rock had prevented rotation.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Thread Starter
Navigator
Joined: Nov 2015
Posts: 9
Likes: 0
From: Monterrey
- the temperature was like 250°, very near of overheat so i turn off the engine
Team Owner
Joined: Dec 2000
Posts: 21,094
Likes: 282
From: Phila., PA burbs
Thread Starter
Navigator
Joined: Nov 2015
Posts: 9
Likes: 0
From: Monterrey
Part 2...
Well it's been a while since i make the post looking for answers for my trouble but i want to thank every one who came with solutions and comments. I went to the workshop and find out 3 things.
- First, the radiator of my vette was broken so i had to replace it.
- Second, the fans actually works perfectly fine and turns on when the temp raises to 228° F and 238° F, actualy made both fans turns on when the temp marks 228° F
- Third, The temp gaunge in the dash was over limit when the Fans turns on, so i choose to replace the coolant temp sensor and the coolant temp gauge sensor....BUT the gauge still go almost to the limit when the temp is at 228° F.
Now i'm thinking the problem for the gauge is the dash because sometimes the numbers of the speed don't show complete or the fuel bar is light gray from the middle to the top but that's another story, thansk again for the replys for the temp and the fans
- First, the radiator of my vette was broken so i had to replace it.
- Second, the fans actually works perfectly fine and turns on when the temp raises to 228° F and 238° F, actualy made both fans turns on when the temp marks 228° F
- Third, The temp gaunge in the dash was over limit when the Fans turns on, so i choose to replace the coolant temp sensor and the coolant temp gauge sensor....BUT the gauge still go almost to the limit when the temp is at 228° F.
Now i'm thinking the problem for the gauge is the dash because sometimes the numbers of the speed don't show complete or the fuel bar is light gray from the middle to the top but that's another story, thansk again for the replys for the temp and the fans