95 lt1 cooling issue
05-23-2010, 09:15 PM
#1
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95 lt1 cooling issue Well, I just got my car back together from replacing the head gaskets with impala ss gaskets, and doing a cam swap to an lt4 hotcam. Now I'm having a big problem with it. When it runs, and starts to get warm, it starts pushing coolant out of the radiator and into the overflow. Any ideas what this could be?
05-23-2010, 09:20 PM
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It has an air bubble in the coolant system and you need to bleed it.
http://shbox.com/1/4th_gen_tech2.html#radflush
http://shbox.com/1/4th_gen_tech2.html#radflush
05-23-2010, 09:58 PM
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I have found the easiest way to bleed it is to get a pressure tester ( after renting one from vatozone for $95 I bought a mac tool one off cl for $45 ) it has proven to be very handy. You can pump up the pressure and bleed the cooling system just like brakes. I've done it four or five times after afew mishaps with the motor.
05-23-2010, 11:30 PM
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It has an air bubble in the coolant system and you need to bleed it.
http://shbox.com/1/4th_gen_tech2.html#radflush
http://shbox.com/1/4th_gen_tech2.html#radflush
Also, I should probably add that it is misfiring as well, which I have a suspicion is a plug wire in the wrong place or not on all the way, but thought that there was a possibility it was related.
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05-27-2010, 09:00 PM
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I'm the OP's brother, he is out of town in milwaukee during the week, so I've been playing around with a little bit. I looked at the hoses on the radiator, of the two smaller hoses near the filler neck the throttle body hose is at the top. The hoses are different sizes though and look like they are how they are supposed to be. I'll try and get a picture during the weekend. I think its still not bled right, with the radiator cap off the coolant coming in is just coming in spurts, and if I open the bleeder going into the thermostat it doesnt come in a steady stream either. I'm thinking a pressure bleeder may be our best bet. Weird thing is, if you open the bleeder on the heater hose the radiator overflows. Has anyone had that happen before?
05-28-2010, 04:42 PM
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i have found out that the best way to bleed the cooling system is too take off the radiator cap and just let the car idle for at least 30 minutes but watch your temp gauge just to be on the same side it shouldn't over heat but still and watch the coolant level i had this problem on my 93 after i replaced my head gaskets and i just actually left it outside idling for like an hour or so and never had a problem since than.
05-28-2010, 05:00 PM
#11
I'm the OP's brother, he is out of town in milwaukee during the week, so I've been playing around with a little bit. I looked at the hoses on the radiator, of the two smaller hoses near the filler neck the throttle body hose is at the top. The hoses are different sizes though and look like they are how they are supposed to be. I'll try and get a picture during the weekend. I think its still not bled right, with the radiator cap off the coolant coming in is just coming in spurts, and if I open the bleeder going into the thermostat it doesnt come in a steady stream either. I'm thinking a pressure bleeder may be our best bet. Weird thing is, if you open the bleeder on the heater hose the radiator overflows. Has anyone had that happen before?
http://shbox.com/1/low_coolant.jpg
The very top hose that you see (the top port closes to the radiator cap) is for the overflow tank. The one right below that is for the TB return hose.
05-29-2010, 11:50 AM
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Well we took a look at those two hoses this morning, they were definitely switched up 
Its running much cooler now! And both bleeders bleed out a steady stream and the overflow isnt... overflowing anymore lol. So now we need to adjust the rockers again and find out what the problem is with the misfire. We'll keep this thread updated with any questions or what we find with the misfire. Thanks for the help so far! 
Its running much cooler now! And both bleeders bleed out a steady stream and the overflow isnt... overflowing anymore lol. So now we need to adjust the rockers again and find out what the problem is with the misfire. We'll keep this thread updated with any questions or what we find with the misfire. Thanks for the help so far!
05-29-2010, 03:52 PM
#13
Well we took a look at those two hoses this morning, they were definitely switched up Its running much cooler now! And both bleeders bleed out a steady stream and the overflow isnt... overflowing anymore lol. So now we need to adjust the rockers again and find out what the problem is with the misfire. We'll keep this thread updated with any questions or what we find with the misfire. Thanks for the help so far!
Its running much cooler now! And both bleeders bleed out a steady stream and the overflow isnt... overflowing anymore lol. So now we need to adjust the rockers again and find out what the problem is with the misfire. We'll keep this thread updated with any questions or what we find with the misfire. Thanks for the help so far! 
