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Weird Cooling Issue

 
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Old 31 Dec 2011, 12:39 pm
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Question Weird Cooling Issue

Just picked up an '01 NA car. 120k - Runs great, but has a weird cooling problem.

So far, the history is: Drove it home over 60 miles, wasn't getting very warm, so I assumed a thermostat bad. Bought new stat and installed. Noticed on the old stat that someone had cut off the bottom and gutted it. (I'm thinking, hmmmm, what are they hiding?)

New stat in, started car, and noticed lots of air and pressure in the system. Drove it a bit, and it was horking coolant out around the cap. Did some investigating and found the coolant overflow line was completely plugged. Pulled it off, and blew it clean, reconnected. Seems slightly better. When driving, the temp gauge goes up to middle, then drops pretty quickly to first line, then goes back up. Sometimes as far as third line, then drops back. Still seems to have a lot of pressure in the system, as it will blow out through the coolant overflow now.

My 1st thought was head gasket, but it's not sucking and burning coolant out the exhaust. I know it probably needs a new timing belt and water pump, just trying to determine if I need to replace the head gasket while I have it apart...

I've seen head gaskets do weird thing before, but nothing like this. Usually if there is a leak to the coolant side, it will also suck coolant and burn it.

Cracked head maybe?

Anyone seen a bad head gasket do anything like this?
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2001 PT Cruiser - NA - 5 Speed - Exhaust and CAI Mods - It's alive!!!
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Old 31 Dec 2011, 12:55 pm
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Default Re: Weird Cooling Issue

did you bleed the air out , by stat there is a bleeder screw,
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Old 31 Dec 2011, 12:59 pm
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Default Re: Weird Cooling Issue

Quote:
Originally Posted by LNBNDN View Post
did you bleed the air out , by stat there is a bleeder screw,
Well, no. I've never had to in the past... But I did hold the new Stat open while warming up the engine. That lets the coolant flow the whole time.
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Old 31 Dec 2011, 01:40 pm
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Default Re: Weird Cooling Issue

Sounds like you have air in the system , I would still try to bleed the system with the bleeder screw .and see what happens . and go from there, could be head gasket .
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Last edited by LNBNDN; 31 Dec 2011 at 01:43 pm.
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