C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Still having Low Coolant problems

Thread Tools
 
Search this Thread
 
Old Feb 8, 2002 | 03:08 PM
  #1  
gpagaduan's Avatar
gpagaduan
Thread Starter
Pro
 
Joined: Oct 2001
Posts: 554
Likes: 1
From: CA
Default Still having Low Coolant problems

Hey,

I'm still having the low coolant light coming on. I've taken it to two shops, one of them the dealership, and they don't detect a leak. I've previously posted that there is no water in my garage or in the parking space at work. I can occasionally smell it and the car does take the water that I add with no problem. This has been going on for at least six months, maybe longer, and so far I haven't noticed any performance problems.

I now suspect the heater the core but I don't have any moisture in the passenger side floor, but I dis notice that the light comes on after I've run the heater. Where the heck it the water going?

The last shop to check it flushed the system, changed the thermostat and put on a new radiator cap.

Maybe it is the gaskets, but you'd think the two shops would've jumped on that repair instead of scratching their heads.

Totally baffled!!
Reply
Old Feb 8, 2002 | 03:24 PM
  #2  
Bluevette85's Avatar
Bluevette85
Drifting
 
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Default Re: Still having Low Coolant problems (gpagaduan)

Do you have a head gasket leak? Any white smoke from the exhaust? Is your oil level going up? You might want to do a compression test.
Reply
Old Feb 8, 2002 | 04:16 PM
  #3  
David-F's Avatar
David-F
Drifting
10 Year Member
 
Joined: Mar 2000
Posts: 1,630
Likes: 1
From: Woodstock GA
Default Re: Still having Low Coolant problems (gpagaduan)

What year is your car?

David Fulcher
Reply
Old Feb 8, 2002 | 04:48 PM
  #4  
Brian Madderom's Avatar
Brian Madderom
Instructor
 
Joined: Dec 2001
Posts: 125
Likes: 0
From: St. Petersburg FL
Default Re: Still having Low Coolant problems (gpagaduan)

I've had it leak out of the heater core and then go out the drain tube and not on the passenger floor. It will look like the A/C is on during a hot day when the water leaks out of the drain tube for the evaporator. I always pressure check the system and watch for a while where the coolant comes from. Hope this helps!
Reply
Old Feb 8, 2002 | 05:27 PM
  #5  
gpagaduan's Avatar
gpagaduan
Thread Starter
Pro
 
Joined: Oct 2001
Posts: 554
Likes: 1
From: CA
Default Re: Still having Low Coolant problems (Bluevette85)

The car is a 1990 coupe. I don't have any noticeable white smoke but it is a little hard to start. Dealership said it was due to a leaky fuel injector that I have yet to replace. Still debating on whether or not to do it myself. The dealership did an oil change when they did the coolant and no water in the oil, no oil in the water. Compression test? Is that the same thing as a pressure test when they look for leaks? Two shops tested for leaks but did not find anything.

Still mystified!!
Reply
Old Feb 8, 2002 | 06:07 PM
  #6  
Bluevette85's Avatar
Bluevette85
Drifting
 
Joined: Nov 2001
Posts: 1,783
Likes: 2
From: Latham NY
Default Re: Still having Low Coolant problems (gpagaduan)

A compression test can tell you if your headgasket leaks. Your remove the spark plugs and connect a compression test guage to each cyclinder and crank the engine. Compare the readings and if one is alot lower than the others, you may have a leak. You can also hook-up an air hose to each cyclinder and look for air bubbles in the radiator filler neck.
Reply
Old Feb 8, 2002 | 07:28 PM
  #7  
David-F's Avatar
David-F
Drifting
10 Year Member
 
Joined: Mar 2000
Posts: 1,630
Likes: 1
From: Woodstock GA
Default Re: Still having Low Coolant problems (gpagaduan)

Is the coolant level getting low or is it that the low coolant light keeps coming on?

David Fulcher
Reply
Old Feb 8, 2002 | 09:06 PM
  #8  
gpagaduan's Avatar
gpagaduan
Thread Starter
Pro
 
Joined: Oct 2001
Posts: 554
Likes: 1
From: CA
Default Re: Still having Low Coolant problems (David-F)

Hey David,

Both. Light comes on and coolant is low.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

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

 Michael S. Palmer
story-1

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

 Joe Kucinski
story-2

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

 Joe Kucinski
story-3

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

 Verdad Gallardo
story-4

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-5

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-6

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-7

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-8

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-9

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
Old Feb 8, 2002 | 09:37 PM
  #9  
TIMSPEED's Avatar
TIMSPEED
Le Mans Master
10 Year Member
 
Joined: Mar 2001
Posts: 9,464
Likes: 1
From: Modesto CA
Default Re: Still having Low Coolant problems (gpagaduan)

I previously had that problem with my 87. I was COMPLETELY stumped. SO, I ENDED up putting in a new radiator $175, along with COMPLETELY new lower and upper hoses tightened VERY tight. That has seemed to fix the problem for me. The trick to filling our cars up is..run the car with the heater on FULL blast, and fill the radiator up. This process is called "burping". Where you let the car run (WITH THE HEATER ON FULL BLAST), until it gets to 160º (Or whatever temp thermostat you have in it), then have someone hold the rpm's at 2000, and you keep filling up the radiator until their are NO air bubbles AT ALL.
Doing this, took me about 10 times, until I FINALLY got it fixed. So far so good. *Knock on wood*

You might also check your expansion tank.
Reply

Get notified of new replies

To Still having Low Coolant problems





All times are GMT -4. The time now is 07:37 PM.

story-0
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-1
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-2
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-3
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
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE