2001 pt crusier over heating on 2001 Chrysler PT Cruiser

change thermosta,had radiator check, it holding pressure, water pump is ok, raditor fan ok

Asked by for the 2001 Chrysler PT Cruiser
get diagnostic run. looking for possible issue with cat. conv. diagnostic will tell for sure what issue is.
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Having same problem, change, radiator, thermostat, belts, water pump, flushed radiator again. Gets hot while driving, cut heater on temperature goes down. Some days it does not get hot at all. Run AC overheat just a little. Please help with any suggestions