C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Coolant temp issue

Thread Tools
 
Search this Thread
 
Old Dec 4, 2012 | 04:17 PM
  #1  
chris308's Avatar
chris308
Thread Starter
Melting Slicks
15 Year Member
 
Joined: Sep 2006
Posts: 2,721
Likes: 104
From: Florida
Default Coolant temp issue

Ok, this is a weird one, i searched but didn't see anything similar...

I just noticed this on my way into work just now.

When i'm at cruising speeds 45-50mph; i see my temp gauge raise to 234* degrees confirmed on the DIC. When i come to a stop, the temps will drop down to about 217-220ish.

No trash in front of the rad, overfill tank is a year old but the cap is not new.
Reply
Old Dec 4, 2012 | 04:36 PM
  #2  
_r2h's Avatar
_r2h
Racer
 
Joined: Oct 2010
Posts: 302
Likes: 2
From: Baton Rouge LA
Default

Possibly a leaky head gasket?

New one for me.
Reply
Old Dec 4, 2012 | 04:43 PM
  #3  
BigGun's Avatar
BigGun
Drifting
10 Year Member
 
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
Default

Originally Posted by chris308
Ok, this is a weird one, i searched but didn't see anything similar...

I just noticed this on my way into work just now.

When i'm at cruising speeds 45-50mph; i see my temp gauge raise to 234* degrees confirmed on the DIC. When i come to a stop, the temps will drop down to about 217-220ish.

No trash in front of the rad, overfill tank is a year old but the cap is not new.
The radiator often gets clogged with sand and small rocks that are not easily seen. A good cleaning would be a first step. If the cap is not leaking it should be fine.
Reply
Old Dec 4, 2012 | 06:21 PM
  #4  
Paul 75 L82's Avatar
Paul 75 L82
Le Mans Master
20 Year Member
 
Joined: Dec 2000
Posts: 5,245
Likes: 25
From: Blue Ridge Georgia
Default

I would be flipping out if my vette saw 234. I would be installing a new rad, pump and stat in a heart beat. None of that is that costly. I pulled my rad out a year ago and gave it a good cleaning, it's really the only good way to clean. Some would say if you go that far just install a new one.
Reply
Old Dec 5, 2012 | 03:28 AM
  #5  
chris308's Avatar
chris308
Thread Starter
Melting Slicks
15 Year Member
 
Joined: Sep 2006
Posts: 2,721
Likes: 104
From: Florida
Default

i'm going to try with the easy stuff first, picked up a new cap on my lunch break and will hose down the rad in the morning.

i hope it's not the head gasket!!
Reply
Old Dec 5, 2012 | 03:59 AM
  #6  
65GGvert's Avatar
65GGvert
Team Owner
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2006
Posts: 22,190
Likes: 4,178
From: Kannapolis NC
Default

Is your center air scoop still on the car?
Reply
Old Dec 5, 2012 | 04:07 AM
  #7  
chris308's Avatar
chris308
Thread Starter
Melting Slicks
15 Year Member
 
Joined: Sep 2006
Posts: 2,721
Likes: 104
From: Florida
Default

Originally Posted by 65GGvert
Is your center air scoop still on the car?
Yes.
Reply
Old Dec 5, 2012 | 08:27 AM
  #8  
65GGvert's Avatar
65GGvert
Team Owner
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2006
Posts: 22,190
Likes: 4,178
From: Kannapolis NC
Default

Since the fans don't run at speed, but do run when stopped, I thought maybe your air flow was not going up through the radiator. The when you slowed or stopped the fans kicked on and pulled air. I'm out of ideas unless the water pump isn't pumping enough at higher rpm's. Be sure to post as you troubleshoot, I'm interested to know what you find.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Dec 5, 2012 | 09:06 AM
  #9  
runner140*'s Avatar
runner140*
Le Mans Master
20 Year Member
Veteran: Army
Liked
Community Favorite
 
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
Default

Things to look at:
Clogged radiator
Collasped radiator hoses
Check for a good flow/circulation of coolant....water pump check.
Do a full system flush and replace with DexCool and distilled water.
Check your thermostat...
Cap change is a no brainer.
The above is cheap and easy to do.
Reply
Old Dec 5, 2012 | 06:50 PM
  #10  
chris308's Avatar
chris308
Thread Starter
Melting Slicks
15 Year Member
 
Joined: Sep 2006
Posts: 2,721
Likes: 104
From: Florida
Default

So I cleaned the rad out with a hose, topped off the overfill tank and used a new cap. Drove to work mid-day; and temps never went past 212* while at a light and cruising saw 189-90ish...

However i noticed i will need a new radiator as it looks like someone tried to jack up the front of the car by using the rad as a jacking point, its crushed on one side but not leaking... yet.
Reply

Get notified of new replies

To Coolant temp issue





All times are GMT -4. The time now is 10:16 AM.

story-0
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-1
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-2
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-3
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
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE