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Old 07-22-2009, 09:24 AM   #9
OverBoost
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I have bled the system multiple times, ensuring there are no bubbles in the system, with a funnel in radiator neck and filled with coolant. I understand it is very stubborn to get all the bubbles out.

Last time I ran it after bleeding, the car got up to operating temperature, then I drove car around block and temp creeped up. When I brought it back into the garage, the temp gauge showed it was on H, all top rad hoses were very hot to touch and were bulging. Top of radiator was very hot, but bottom of it was cool to touch.

I can't see after bleeding this system repeatedly that air bubbles could still be causing this. I think the T-stat is not opening or is not opening all the way. Keep in mind I did not have this problem before the rebuild with the old crummy OEM radiator.

Also, since it's an aluminum radiator, at twice the stock thickness, I am thinking the coolant coming out of the bottom of the radiator into the t-stat is just not warm enough to cause the t-stat to open properly.

I'm going to boil the t-stat tomorrow and see if I can ensure it's opening and closing properly.
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