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Chrysler 300M Problems

Poor Heat Output and/or Engine Overheating on Chrysler 300M

Problem Description and Possible Solution

Poor output from the heater and/or engine overheating can be caused by air left in the cooling system after the cooling system has been serviced. Our technicians tell us the proper coolant fill procedure should be used to prevent this problem from occurring.

(34 people reported this problem)

Chrysler 300M Vehicles With This Problem

RepairPal Verified
Average mileage: 316,600 (13,000–2,000,000)
6 model years affected: 1999, 2000, 2001, 2002, more2003, 2004
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Brake problem? Or maybe a faulty head gasket cylinder?
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Viewing 1-9 of 9 comments
Car begins to overheat but will level out if I slow down and keep the heat on full blast. There hasn't been any leaking that I have found. Antifreeze is full and fresh. Problem had yet to be solved
i did the head gasket , replace water pump,radiator,thermostat,coolan sensor and the anteefreze start boiling after 5 minutes
purged cooling system to replace radiator. Since doing so engine overheats immediately upon starting. Temperature gauge on panel says in normal operating range. New gauge shows going over 200 degrees? Lower radiator hose doesnt get hot till 190 degrees. Replaced thermostat and original temp sensor. have not yet figured out what to do.
I have a 2003 Chrysler 300 and it keeps overheating and I'm not sure why .my son has flushed the radiator and we just got a new heater core put in it .if you have any suggestions as where to go to next that would be great .thank you very much .