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2008 Chrysler PT Cruiser - No heat

My PT CRUISER will not heat up!
My mechanic has changed out the
Heater core. any ideas?

Does your temperature gauge show normal operating temperature?
If so, then it is probably the blend door.

I don’t know about your cruiser, but my 01 was a bear to do heater core. Like purebred said, get it to operating temperature with heater to hot, if normal, feel the heater hoses. If the hoses are hot then it’s probably a door, but if it’s cold there’s circulation problems.