coolant temp after head gasket
Thread Starter
Instructor
Joined: Apr 2008
Posts: 154
Likes: 0
From: Parkville Missouri
coolant temp after head gasket
I just did head gaskets, replaced my coolant sensor in the passenger head. and when i fire it up my digital read out is slowly increasing, while my analog gauge will just climb fast. it pegged 260 while digital was reading 160 and it had only been running for maybe 5 minutes. can anyone help make sense of this, could it be because i havent completely bled the coolant, i saw this happening so i quit bleeding at that time
Drifting
Joined: Aug 2009
Posts: 1,615
Likes: 3
From: Tampa Fl
try burping it now with the engine off,if air comes out like mine did,thats your problem,I think there may be 2 sesors one for anologe and one for the digital gage.My anologe was pegged also and digital only said 190,shut it off burped it for about 30 sec,everything good now
Thread Starter
Instructor
Joined: Apr 2008
Posts: 154
Likes: 0
From: Parkville Missouri
well ive burped it three times now and after letting it cool and doing it again and again im getting a lot of air, how long does it take to bleed an lt1 after doing a head gasket?
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Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
I suggest you follow the procedure in your Owner's Manual. The one for my 96 doesn't mention anything about running the engine, then shutting it down and steam.
You didn't mention the year of your car, but doing it the GM recommended way would be the first thing I do and if that doesn't work I'd then try to find out why. No way to really tell if you have a problem or not without first following the recommended procedure.
Jake
You didn't mention the year of your car, but doing it the GM recommended way would be the first thing I do and if that doesn't work I'd then try to find out why. No way to really tell if you have a problem or not without first following the recommended procedure.
Jake
Advanced
Joined: Jul 2010
Posts: 78
Likes: 1
From: Cape Town
Here's an article on how to test the temp readings and bleed the motor
http://www.shbox.com/1/4th_gen_tech2.html
However , if after bleeding you are getting a lot of "air" in the system , I would use one of those thingys that check for combustion gasses in the coolant , especially after changing head gaskets - could be an issue with the gaskets.... Or a cracked head --- hopefully not ...
http://www.shbox.com/1/4th_gen_tech2.html
However , if after bleeding you are getting a lot of "air" in the system , I would use one of those thingys that check for combustion gasses in the coolant , especially after changing head gaskets - could be an issue with the gaskets.... Or a cracked head --- hopefully not ...
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
My car's a 96 so I can't guarantee the procedure is the same for the 92, which is why I suggested you reference your Owner's Manual.
However for the 96, GM cautions that the engine has a specific bleed procedure. That failure to follow the procedure could cause your engine to overheat and can be severely damaged.
The radiator cap is removed, engine off. Bleed screw on the thermostat housing is loosened and coolant is poured into the reservoir. This will force a coolant and air mixture from the bleed screw.
When air no longer accompanies the coolant from the bleed screw you tighten the bleed screw and top off the reservoir with coolant.
The Opti should be covered with several layers of terri-cloth towels/rags to prevent any coolant from getting into the Opti.
Make sure the over-flow bottle (near passenger side headlight) has adequate amount of coolant.
Fire the engine and allow it to idle about 4 minutes. Then add more coolant through the reservoir until the level reaches the base of the filler neck.
Shut down the engine and replace the pressure cap. As the engine begins to cool, any additional coolant that the system needs will automatically be drawn into the cooling system from the over-flow bottle IF all the hoses are tight and leak free.
Jake
However for the 96, GM cautions that the engine has a specific bleed procedure. That failure to follow the procedure could cause your engine to overheat and can be severely damaged.
The radiator cap is removed, engine off. Bleed screw on the thermostat housing is loosened and coolant is poured into the reservoir. This will force a coolant and air mixture from the bleed screw.
When air no longer accompanies the coolant from the bleed screw you tighten the bleed screw and top off the reservoir with coolant.
The Opti should be covered with several layers of terri-cloth towels/rags to prevent any coolant from getting into the Opti.
Make sure the over-flow bottle (near passenger side headlight) has adequate amount of coolant.
Fire the engine and allow it to idle about 4 minutes. Then add more coolant through the reservoir until the level reaches the base of the filler neck.
Shut down the engine and replace the pressure cap. As the engine begins to cool, any additional coolant that the system needs will automatically be drawn into the cooling system from the over-flow bottle IF all the hoses are tight and leak free.
Jake
Last edited by JAKE; Sep 10, 2010 at 01:30 AM.
