Question about 2003 Chrysler PT Cruiser

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2003 pt cruiser overheating

I already replaced the thermostat and it still overheats after about 10 miles. it bubbles fluids. have taken it to mechanic and he cant get it to overheat and i drive it and it does it. he cant figure it out. also last summer my air conditioner went out. it didnt blow then blew some fluids out everywhere. then i turned it on the few weeks back and it worked. but now it sometimes blows cold and when it dont it almost kills my car. PLEASE HELP!!! i can barely afford to make the payments on it let alone fix this major problem.

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  • ougirl Jun 16, 2009

    yes. as long as i can keep it below 2RPM and a little above 1 it dont go up to much. i mainly drive it around town.

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It sounds like both problems are related. Possible that you have an intermitent problem with the cooling fan on the radiator? When it overheats are you in town at slow speeds or out on the road moving above 50?

Posted on Jun 15, 2009

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1 Answer

Why is my 2006 pt cruiser still overheating and bubbling when i replaced the radiator the thermostat and the o2 censor


O2 sensor has nothing to do with engine overheating. Are you losing coolant? Did you bleed all the air out of the cooling system after replacing radiator? Have you checked the coolant for exhaust gas byproducts? You may have a bad head gasket, or a cracked block/head if you ran the car for an extended period while overheated.

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1998 intrigued Oldsmobile with 3 hundred thousand miles on it it runs hot only when drivin it


sounds like a thermostat issue or could have an air bubble in the system caused by a small leak or underfilling or improper bleeding of the system. there can be NO air in the cooling systems of new vehicles!!! they will lose prime quickly and overheat!

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You should always replace the Thermostat. It may be stuck shut.

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Jul 22, 2010 | 2002 Chrysler PT Cruiser

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Mechanic went to change out the thermostat on the 03 Cruiser...drove it back to me..overheated when he got it back...removed the thermostat to see if that would at suppress the overheat problem until the...


Removal of the thermostat from the cooling system is not a good idea. This upsets the coolant flow rate in the system, and that can cause the engine to overheat, even when no other problem with the cooling system exists.

Try to identify the cause of the overheating.

Ensure that engine tune, or other engine mechanical fault condition is not the cause of the overheating, then go through the checklist following:-

1) Check engine cooling fan/s are operating as required when engine temp rises above cut-in threshold - check fan control relay is ok,
2) Check for collapsing radiator hose on suction side of water-pump when motor revs raised above idle.
3) Check coolant reservoir pressure cap is serviceable,
4) Check coolant system is properly filled - carry out any bleed off procedure specified to clear any air locks- (ensure heater core coolant flow is turned on).
5) Check for combustion gas bubbles in the coolant reservoir while the motor is running - this indicates a blown head gasket. If in doubt, take it to a radiator shop and ask for a combustion gas check on your radiator.
6) Check condition of radiator core:-
i) for blockage of air flow to (bugs/grass etc),
ii) for core internal blockage to coolant flow,

If all above ok, replace the thermostat again (also ensure it is not installed upside down) - faulty new thermostats are not unheard of.

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Sounds like a sticking thermostat (temp up/down).
In an emergency, you can remove it, but replace it soon.

I otherwise suspect the radiator fan, but it shouldn't overheat if you are on a highway going faster than 50mph (enough air blows through the engine compartment).

Everything else you describe does not indicate any other solution.

I suppose it could be the radiator fan RELAY SWITCH or loose wire to it.

Hope this helps....

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Check your oil dipstick for coolant, or a mucky substance. Your symptoms sound like a blown head gasket.

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