Question about 2001 Chrysler PT Cruiser

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2001 PT cruiser overheating.

My 2001 PT cruiser started to overheat recently while sitting in traffic. My mechanic said the electric cooling fan wasn't working so he replaced it, along with two belts and also flushed the cooling system. I ran it a couple of hours and it really started overheating, very quickly. I tried to cool it down by running the heater but it was blowing cool??? Its sitting in the yard now and I am afraid to run it as it may damage the motor. I just spent $500 and the problem is even worse now. Could the thermastat be sticking? What gives? The car has a 2.4 liter engine
in it. (Non Turbo)

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  • wa4md Aug 02, 2010

    The coolant was out. My mechanic swore he refilled it when he flushed it the day before. I refilled it myself and havn't had any
    more problems, so far. He said the thermostat may have
    gotten temporarily stuck???

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Note that you will not damage anything unless you don't turn it off when it gets too hot.

So start the car and let is idle to get warm - have the hood open and see if the fans come on. If the temp goes past normal and fans do not kick on, it's usually the fan relay (~$20) - these usually sit in the engine compartment fuse box. Also check the fan fuses - there should be two of them. If that doesn't work, then it would be the temp sensor.

However if your heater is blowing cold when the car is warm, sounds like there is an air-lock. This happens if you don't 'burp' the cooling system properly after flushing the system. Easiest way to check on this is if either the lower or upper radiator hose is not hot when the engine is hot.

Incidentally, if the thermostat is shot, you would not be able to 'burp' the system properly.

My bet is either the thermostat or airlock - or both.

Posted on Jul 31, 2010

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If the engine was very hot but the heater was blowing cold air the engine has an air lock in the water jaket it need to be blead out to get the air out,,,fill the rad up with water,,(not the header tank) look at the water pipes in the engine bay the pipe that is the higest one to the tiop of the engine should have a bolt or a screw in it,,,start the engine up undo this bolt or screw and let the water and air out till only water come out this should clear out any air in the engine,,,if it still over heats,,check the cooling fans and there switches are working also check the thermostat, but you will need to reblead the air out if you take out the thermostat,,bont mess with it just fit a new one! check the rad is clear and free flowing,,or get a "sniffer test!" done on the engine cooling water
this test looks for "hydrocorbons!" in the water,,if there there the head gasket has blowen or is leaging hot gases into the water jaket this will boile the water up,,,,,i hope this is of help to you???
ps,,the human brain is like a shoping trolly,,full up with good things,,
mine is full of junk like that lot!!!!!!!!!!

Posted on Jul 31, 2010

  • Mobile Mike Oct 29, 2013

    you need to perform a combustion gas test on the cooling system make sure you don't have a cracked head

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