94 LT1 coolant bubbling
Thread Starter
Racer
Joined: Feb 2002
Posts: 327
Likes: 0
From: Island Heights N.J
94 LT1 coolant bubbling
I have a 94 LT1 . The problem I am having is that my coolant is bubbling especially when the car is turned off after a short drive . The car never overheated but it does reach 230 . Iam thinking this is an indication of a head gasket leak . But there is no white smoke and the oil is not milky . Could this be an intake gasket leak ? I have not done a pressure test yet .
Racer
Joined: Apr 2006
Posts: 327
Likes: 0
From: edgerton WI
Bleed the air out of the system first. If that dose not clear it up then start checking for head gaskets and such.An easy way to check for a head gasket leak is to use a compression tester hose and compress air into each cylinder. and watch for bubbles. Make sure cylinder being tested is at bdc with both valves closed. Also look at spark plugs for discoloration. Some times its hard to see the steam from water leaking into the cylinder.
Last edited by 84vette96; Mar 21, 2011 at 01:35 PM.
Thread Starter
Racer
Joined: Feb 2002
Posts: 327
Likes: 0
From: Island Heights N.J
Bleed the air out of the system first. If that dose not clear it up then start checking for head gaskets and such.An easy way to check for a head gasket leak is to use a compression tester hose and compress air into each cylinder. and watch for bubbles. Make sure cylinder being tested is at bdc with both valves closed. Also look at spark plugs for discoloration. Some times its hard to see the steam from water leaking into the cylinder.
Racer
Joined: Apr 2006
Posts: 327
Likes: 0
From: edgerton WI
On the thermostat neck there is a brass fitting. Start the car with the radiator cap off . Top off the water and then rev the engine a little while loosening the screw with a wide common screwdriver. When coolant comes out close the screw. and replace the cap.
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
The heater core may be bad or the plastic piece that the hose connects to just before the heater core is cracked and you just cant see it yet.You can't presure test these systems with more than 16 lbs or you will blow out the plastic restrictor and at a 14.95 and shipping 15 bucks you need to have it in the system so the heater core doesn't burst.
http://www.ecklers.com/corvette-hot-...1992-1996.html
If you don't have this in the system it will blow the heater core!
If you haven't messed with the cooling system then the heater core is the problem.
If it is making a bubbling sound when you shut it off,the valve could be broken.
Burping it would be usless!
http://www.ecklers.com/corvette-hot-...1992-1996.html
If you don't have this in the system it will blow the heater core!
If you haven't messed with the cooling system then the heater core is the problem.
If it is making a bubbling sound when you shut it off,the valve could be broken.
Burping it would be usless!
Last edited by REDC4CORVETTE; Mar 23, 2011 at 06:53 AM.
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
I have a 94 LT1 . The problem I am having is that my coolant is bubbling especially when the car is turned off after a short drive . The car never overheated but it does reach 230 . Iam thinking this is an indication of a head gasket leak . But there is no white smoke and the oil is not milky . Could this be an intake gasket leak ? I have not done a pressure test yet .
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Melting Slicks
Joined: Aug 2008
Posts: 2,082
Likes: 50
From: Palmdale CA
The "first" thing you should test is the pacific gravity of your anti-freeze, with
a coolant "hydrmeter".
your boiling point might be too low!
If this test shows the proper mix...then proceed with the block test.
