'93 Overheating at Idle
Thread Starter
6th Gear
Joined: May 2024
Posts: 6
Likes: 1
'93 Overheating at Idle
I have a 93 Lt1 that recently started to overheat, but it only does it while idling. This has also been paired with high revving. Both idling and driving. Dont know if its connected.
Within a span of 10 minutes just from sitting it almost reached 260 before I shut it off. Revving will go up and down to 1000rpm. Highest its gotten is 2000rpm.
It doesnt heat up while its driving though, it actually cools down as long as its consistently running.
I read someone had the same over heating problem and suggested burbing the coolant. Thoughts?
Within a span of 10 minutes just from sitting it almost reached 260 before I shut it off. Revving will go up and down to 1000rpm. Highest its gotten is 2000rpm.
It doesnt heat up while its driving though, it actually cools down as long as its consistently running.
I read someone had the same over heating problem and suggested burbing the coolant. Thoughts?
Burning Brakes
Joined: Aug 2008
Posts: 861
Likes: 220
From: Tampa, FL
I have a 93 Lt1 that recently started to overheat, but it only does it while idling. This has also been paired with high revving. Both idling and driving. Dont know if its connected.
Within a span of 10 minutes just from sitting it almost reached 260 before I shut it off. Revving will go up and down to 1000rpm. Highest its gotten is 2000rpm.
It doesnt heat up while its driving though, it actually cools down as long as its consistently running.
I read someone had the same over heating problem and suggested burbing the coolant. Thoughts?
Within a span of 10 minutes just from sitting it almost reached 260 before I shut it off. Revving will go up and down to 1000rpm. Highest its gotten is 2000rpm.
It doesnt heat up while its driving though, it actually cools down as long as its consistently running.
I read someone had the same over heating problem and suggested burbing the coolant. Thoughts?
Drifting
Joined: Nov 2018
Posts: 1,793
Likes: 579
From: Mays Landing, NJ
As already stated, you need to determine if the cooling fan comes on when temps reach 228-230. Before that did you see if you have the proper level of coolant in the system. Even if proper amount of coolant in system and fan comes on when temp is reached the radiator fins may be clogged with trash and dirt .You need to check the items stated to determine next steps you can do.
Melting Slicks
Joined: Oct 2003
Posts: 2,175
Likes: 821
From: Chapel Hill NC
2025 c3 ('68-'73) of the Year Finalist - Unmodified
2025 C4 of the Year Finalist - Unmodified
2025 C8 Stingray of the Year Finalist - Unmodified
I recommend that you read the Sticky: Corvettes,Summer, and High Coolant Tempertures in the C3 General Discussion section.
Thread Starter
6th Gear
Joined: May 2024
Posts: 6
Likes: 1
Thread Starter
6th Gear
Joined: May 2024
Posts: 6
Likes: 1
As already stated, you need to determine if the cooling fan comes on when temps reach 228-230. Before that did you see if you have the proper level of coolant in the system. Even if proper amount of coolant in system and fan comes on when temp is reached the radiator fins may be clogged with trash and dirt .You need to check the items stated to determine next steps you can do.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
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
Drifting
Joined: Nov 2018
Posts: 1,793
Likes: 579
From: Mays Landing, NJ
If the fan is coming on around 230 the temp should start to tick back down. If it doesn't my next step would to insure the thermostat is fully opening and the radiator cap is holding proper pressure. Both the thermostat and radiator cap are low cost and easy to replace. I've replaced both on my 95 this year. Thermostat because it wasn't opening fully and the cap because it was not holding pressure which caused coolant to flow into the overflow and causing the coolant to overflow from the container