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ase_master327, Shop Owner
Category: Car
Satisfied Customers: 5288
Experience:  +15 years experience on imports and domestics. Bumper to bumper diagnosis & repair.
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2002 chrysler 300M: heater was blowing cold air..common problems

Customer Question

2002 chrysler 300M heater was blowing cold air. what are common problems with this?
Submitted: 8 years ago.
Category: Car
Expert:  ase_master327 replied 8 years ago.
Hello, and thank you for choosing Just Answer!

There is a TSB that deals with this problem. You might find it helpful, it deals with filling the cooling system, and these exact same problems you describe. Here is a copy of it.

BUT, if there was no leak, then what caused it to happen, in the first place? If properly refilling the system doesn't do the trick, then you will have to pressure test the cooling system to test for other leaks.

If you can't find any and the engine still overheats, and is full of coolant, then the engine will need a block test to verify a blown head gasket or cracked engine casting type of situation, where exhaust gasses are being pumped into the cooling system, and just pushing all of the coolant out of the system..A telltale sign of this is the cooling system will not pressure up when you try the test to look for leaks.