Question about 2001 Chrysler PT Cruiser

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Can the thermostat cause the antifreeze reservoir to overflow?

Posted by Anonymous on

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In short, yes it can but you should also see the coolant temperature getting high. Another reason, besides the scary head gasket horror stories here, is the radiator cap could be bad. The system is a closed system. If the cap cannot hold the pressure of the cooling system, usually 15-17lbs., it will let the coolant escape into the reservoir. If the reservoir is full, it will overflow.

Also, check the coolant level in both the radiator and the reservoir when the engine is cold. Fill the radiator to the top and fill the reservoir to the full line. Do not overfill the reservoir and if it has too much in it, try to siphon it out.

Good luck,
Vinnie

Posted on Apr 16, 2015

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Sounds more like a head gasket

Posted on Apr 16, 2015

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Major $$$ will be a bad head gasket, signs of exhaust over-pressurizing the coolant system & sometimes oil will look like milkshake

also, radiator cap keeps a constant pressure up to a certain psi rating... depending on year make model and engine size

if that cap lose it's ability to hold pressure, it can cause the reservoir to overflow

that's the cheaper of the 2 ~ you can rent a cooling system tester to test the cap

http://www.autozone.com/loan-a-tools/pressure-tester-adapters

if the thermostat is stuck closed, you wont have heat and your temp gauge should have spiked to Hot!

if the thermostat is stuck open, your temp gauge will take forever to reach normal operating temperature

clogged radiator may sometimes be a cause as well

Posted on Apr 16, 2015

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Yes if stuck closed

Posted on Apr 16, 2015

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