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Re: 2001 pt cruiser
I recently had the same problem with my car. The solution for me was to remove the coolant lines going into the firewall(be sure to let it cool down first)and blow out the heater core with compressed air.I went from blowing barely luke warm air to awesome heat...good luck
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Check your coolant level first and then check your radiator pressure cap. If not one of these it is likely a sensor/valve in the system controller and you will likely need to go to a reapir shop for help.
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.
Most thermostats are located in the upper radiator hose housing mounted to engine block. Make sure engine is cold put a catch pan under your car to catch any antifreeze that comes out. Remove the two bolts holding the housing on the engine and remove thermostat and gasket. Clean engine block where gasket goes very good and also the housing, have to remove all gasket material so when installing new one it will seal and wont cause a leak. Make sure when you put the thermostat back in it goes in spring side down towards engine. Replace housing and bolts. replace lost coolant with a 50/50 mixture in your recovery tank. Start engine let heat to temp and check for leaks.