1995 Cooling Problem
Thread Starter
4th Gear
Joined: Dec 2005
Posts: 4
Likes: 0
From: Westerly RI
1995 Cooling Problem
I'm new to the forum and fairly new to my C4. To be brief, my cooling fans don't come on. The fans come on in low speed mode when the A/C is on (which is normal per the service manual). I'm suspecting the engine coolent sensor or (please God, no) the PCM, but I'd appreciate any other input before buying parts. I don't have access to the TECH1 diagnostic tool referred to in the service manual or any other scanning device...thanks.
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
A manual overide is basically a toggle switch and some wire. I think what he's speaking of is a temperature controlled switch, also known as an index switch. They can be purchased to activate at various temperatures and as normally open or normally closed, all depending on your needs.
Safety Car
Joined: Sep 2002
Posts: 4,971
Likes: 9
From: The reason time exists is so everything doesn't happen at once
How warm does your engine get? The primary fan comes on around 228* and the secondary at 235*. Both come on with the AC regardless of temp. So if your engine doesn't get to the primary trigger temp the fans won't come on.
Le Mans Master
Joined: May 2005
Posts: 7,340
Likes: 2,272
From: Central Maryland
Originally Posted by jrzvette
How warm does your engine get? The primary fan comes on around 228* and the secondary at 235*. Both come on with the AC regardless of temp. So if your engine doesn't get to the primary trigger temp the fans won't come on.
Be well,
SJW
Le Mans Master
Joined: Oct 2004
Posts: 7,706
Likes: 485
From: Everett WA
C4 of Year Finalist (appearance mods) 2019
You mention that the fans come on "in low speed mode" when the ac is on. I think that there is only one speed on these fans. When they are on, they are on.
I run with my ac on all the time and thus have no worries even in stop & go traffic.
I run with my ac on all the time and thus have no worries even in stop & go traffic.
Race Director
Joined: Aug 2003
Posts: 13,421
Likes: 8
From: Lake Mary Florida
Take a look at this post, I posted a lot of general information on how the system operates, what variables determine turning on and off cooling fans, and a few answers to some questions.
Hope it helps.... some!
http://forums.corvetteforum.com/show....php?t=1481192
[edit] link was for page 2 (I fixed it), scroll down towards the bottom of page 1 and on over to page 2.
Hope it helps.... some!
http://forums.corvetteforum.com/show....php?t=1481192
[edit] link was for page 2 (I fixed it), scroll down towards the bottom of page 1 and on over to page 2.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
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
Melting Slicks
Joined: Feb 1999
Posts: 3,261
Likes: 9
From: sonoma ca
Originally Posted by Mr. Peabody
You mention that the fans come on "in low speed mode" when the ac is on. I think that there is only one speed on these fans. When they are on, they are on.
I run with my ac on all the time and thus have no worries even in stop & go traffic.
I run with my ac on all the time and thus have no worries even in stop & go traffic.