fan not running
Thread Starter
Advanced
Joined: May 2007
Posts: 61
Likes: 2
From: kentucky
2017 C6 of Year Finalist
fan not running
i noticed my temp raising high while in town not getting over 30 mph with ac off, i checked futher and the fans only come on when the ac is turned on,i have a 94 at what temp should the fan come on?i am guessing its the relay if so were is it located? thanks rick
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Define high. Fans come on ~220*, give or take a few degrees.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Did this last summer.
Originally Posted by RRT vette
I spent about 45 minutes observing the coolant temperature operation range on my stock (never modified) 95 LT1 with 50,000 miles. I started the engine and let the temp rise. All of the info is while at idle and the outside temp 80*. Idle temp reached 228* before both fans came on and never saw the temp past 230* via digital guage. Analog guage was in the hash marks and showed approx. 250* from guessing, 260* being the highest number which is miss leading. The temp dropped to 217* and both fans cut off. With the A/C on the temps sat around 201-205* and never got lower or higher. This I consider normal at idle and when driving at about 55 mph the digital temp guage stays around 185-190* range.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Have you observed when the fans come on with the A/C off? Let it idle and watch the digital coolant temp. If the fans come on with the A/C on, then the relay is good.
You probably have trash buildup between the radiator and condenser.
You probably have trash buildup between the radiator and condenser.
Thread Starter
Advanced
Joined: May 2007
Posts: 61
Likes: 2
From: kentucky
2017 C6 of Year Finalist
fans come on with ac,whats the best way to clean it out?
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
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: Oct 2005
Posts: 11,772
Likes: 177
From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
What does the digital gauge read?
That analog gauge will get right up close to the hash mark when the digital gauge is reading 228. As long as it does not go INTO the hash mark, you should be ok. GM recommends shutting the engine down at 260.
A modern cooling system in proper working order can handle 230 - 240 degrees pretty easy. Your car should not see 240 if everything is working as it should though.
Watch the digital gauge while sitting at an idle. It should get up to 228 or so, and then drop back down. If it continues to climb up past 235, then you should check into an airflow problem. Either fans, but probably more likely trash in blocking the radiator fins.
That analog gauge will get right up close to the hash mark when the digital gauge is reading 228. As long as it does not go INTO the hash mark, you should be ok. GM recommends shutting the engine down at 260.
A modern cooling system in proper working order can handle 230 - 240 degrees pretty easy. Your car should not see 240 if everything is working as it should though.
Watch the digital gauge while sitting at an idle. It should get up to 228 or so, and then drop back down. If it continues to climb up past 235, then you should check into an airflow problem. Either fans, but probably more likely trash in blocking the radiator fins.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Here is an easy way to clean debris out of your radiator although it isn't as good as radiator removal. I use my garden hose adjusted for the smallest diameter stream and shoot it backwards through the radiator while holding the fan so it doesn't turn. If your temps are like RRT's, your radiator is pretty clean. My 87 left idling in summer temps (no a/c on) will rise to 228 F, the main fan comes on and engine coolant drops to 211 F and the fan shuts off, and it will repeat.
Thread Starter
Advanced
Joined: May 2007
Posts: 61
Likes: 2
From: kentucky
2017 C6 of Year Finalist
What does the digital gauge read?
That analog gauge will get right up close to the hash mark when the digital gauge is reading 228. As long as it does not go INTO the hash mark, you should be ok. GM recommends shutting the engine down at 260.
A modern cooling system in proper working order can handle 230 - 240 degrees pretty easy. Your car should not see 240 if everything is working as it should though.
Watch the digital gauge while sitting at an idle. It should get up to 228 or so, and then drop back down. If it continues to climb up past 235, then you should check into an airflow problem. Either fans, but probably more likely trash in blocking the radiator fins.
That analog gauge will get right up close to the hash mark when the digital gauge is reading 228. As long as it does not go INTO the hash mark, you should be ok. GM recommends shutting the engine down at 260.
A modern cooling system in proper working order can handle 230 - 240 degrees pretty easy. Your car should not see 240 if everything is working as it should though.
Watch the digital gauge while sitting at an idle. It should get up to 228 or so, and then drop back down. If it continues to climb up past 235, then you should check into an airflow problem. Either fans, but probably more likely trash in blocking the radiator fins.
