LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Cooling issues

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Old 10-06-2008, 06:50 PM
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Default Cooling issues

Ok, here's my dillema. My cluster temp gauge has been acting up the last few weeks so I went ahead and installed a scan gauge to see if the pcm was getting roughly the same reading and they were completely different. I have been ignoring the cluster gauge but lately it has been getting hot so today I let it idle and the fans turn on when they are suppose to.
The thermostat is a 160 and I did have it out of the car earlier this summer and boiled it just for the hell of it and it was fine. Other then that I haven't messed with the cooling system all summer so unless an air bubble just appeared for no reason that shouldn't be an issue.
I have a custom radiator from OFI and 2 spal fans that are less than a year old.
When the car got hot only two radiator hoses were hot too. THe upper hose that goes to the t-stat and the small d.s. 90* fitting that goes to the lower d.s. radiator were hot and the rest were cold.

What do you guys think? I will try and bleed it but I wonder if the water pump has taken a **** hence no circulation and some hoses still cold? It isn't leaking out the weap hole and it isn't squealing.
Old 10-06-2008, 08:24 PM
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I would try to bleed system. Might have an air pocket in it. Other than that the T-stat might not be opening.
Old 10-06-2008, 08:29 PM
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I just went to bleed it and there was no coolant in the upper hose to bleed and the whole time it ran it just blew steam out the hole. WTF?
Old 10-06-2008, 09:17 PM
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let it bleed off untill u see coolant. You may need to fill with water a few times but keep letting it bleed. u have some major air in the lines
Old 10-06-2008, 09:56 PM
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The expansion tank I have to fill through is full. The car ran for probably five minutes and I shut it down at about 225. Not a drop of coolant came up through the bleeder.
Old 10-06-2008, 10:34 PM
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........................ Thats a little weird. Have you tried it with out a T-stat at all. You wont get any heat worth a crap.
Old 10-07-2008, 06:22 PM
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I haven't tried without the thermostat. The heater was still blowing cold when I shut the car off. I think I'll keep trying to bleed it a few more times.
Old 10-07-2008, 06:38 PM
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Try to get the front of the car off the ground some, so that the bleeder screw is the highest point in the system.

Sara Lou
Old 10-07-2008, 06:55 PM
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I tried it again and no go. My driveway is really steep so the front was up pretty high. I'm betting on the water pump, its a good excuse to go to an electric i guess.



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