C4 General Discussion General C4 Corvette Discussion not covered in Tech

Overheating issue

Thread Tools
 
Search this Thread
 
Old May 21, 2023 | 11:52 PM
  #1  
Fred762's Avatar
Fred762
Thread Starter
Navigator
 
Joined: May 2023
Posts: 9
Likes: 2
Default Overheating issue

I recently bought a 1989 c4 corvette as a second car/project car but i wanna make her a daily, but every time i drive her for too long she overheats and coolant starts to boil over top of reservoir. I believe it might be a bad radiator or thermostat, but im not entirely sure. Any help?
Reply
Old May 22, 2023 | 06:11 AM
  #2  
Hunteralexander's Avatar
Hunteralexander
Advanced
 
Joined: Apr 2023
Posts: 99
Likes: 14
From: Erie Pa.
Default

Morning. Check this thread out. Everything you need to know. Helped with mine.

Corvettes, Summer, and High Coolant Temperatures - CorvetteForum - Chevrolet Corvette Forum Discussion
Reply
Old May 22, 2023 | 12:20 PM
  #3  
Cruisinfanatic's Avatar
Cruisinfanatic
Le Mans Master
Supporting Member
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2004
Posts: 6,229
Likes: 698
From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
Default

Originally Posted by Fred762
I recently bought a 1989 c4 corvette as a second car/project car but i wanna make her a daily, but every time i drive her for too long she overheats and coolant starts to boil over top of reservoir. I believe it might be a bad radiator or thermostat, but im not entirely sure. Any help?
drain and remove the radiator and clean the fins. They probably look like this. Install new thermostat also


Reply
Old May 22, 2023 | 12:39 PM
  #4  
Tom400CFI's Avatar
Tom400CFI
Team Owner
Pro Mechanic
20 Year Member
 
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Default

^That, plus flush the engine block and heater core. Lack of maintenance got the car to the point that it's at now (overheating).....now you get to do it, and do it thoroughly.
Reply
Old May 22, 2023 | 12:55 PM
  #5  
Talfryyn's Avatar
Talfryyn
Instructor
All Eyes On Me
Liked
Top Answer: 1
 
Joined: Sep 2022
Posts: 209
Likes: 81
From: Dalbo, Minnesota
Default

FWIW, mine just needed the reservoir cap replaced.
Reply
Old May 22, 2023 | 03:31 PM
  #6  
Fred762's Avatar
Fred762
Thread Starter
Navigator
 
Joined: May 2023
Posts: 9
Likes: 2
Default

Originally Posted by Cruisinfanatic
drain and remove the radiator and clean the fins. They probably look like this. Install new thermostat also
I bought a new radiator just for the hell of it and also bought a new t stat, im gonna throw them babies in wednesday and see how she runs, thanks for the help!​​​​​​
Reply

Get notified of new replies

To Overheating issue





All times are GMT -4. The time now is 05:13 PM.

story-0
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

Slideshow: Is the 2027 Chevrolet Silverado 1500 the best Silverado yet?

By Michael S. Palmer | 2026-06-16 08:01:12


VIEW MORE
story-1
5 Best & 5 Worst Corvette Daily Drivers

Slideshow: 5 best and 5 worst Corvette daily drivers

By Joe Kucinski | 2026-06-15 10:32:13


VIEW MORE
story-2
The Headlights of Every Corvette Generation Explained

Slideshow: The headlights of every Corvette generation explained

By Joe Kucinski | 2026-06-15 10:17:14


VIEW MORE
story-3
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-4
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-5
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-6
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-7
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-8
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-9
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE