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does the windshield fog up? is there a sweet smell in the car? is the color of the fluid the same color of the coolant? is your car loosing coolant? then yes if it the heater box has a drain for water that gets plugged up
Symptoms of a damaged heater core is moisture and the odor of coolant in the cabin as well as the possibility of coolant puddled in the passenger floorboard. The heater core is inside the dash and requires removal of the dashboard assembly in most vehicles. Unless you are comfortable with a large amount of work disassembling the dash, I would refer this to a competent mechanic.
if its not blowing then the heater motor is not coming on . first check the fuse then check for power at the blower motor if no power to the motor replace the blower motor resistor located on the same heater box as the blower motor
Why do you think you need a heater? Has the fan stopped blowing or are you referring to the need to replace the leaking gasket in the heater core?
If you take it to a mechanic for the heater core gasket, you can expect $1200-$1400 just to replace a $0.80 part. It is very labor intensive but can be done yourself if you have about 6 hours.
I think the steps to replace the 'heater core' are a few too many to list here- sry and it is a pain to do in most vehicles- im not familiar on the exact steps on the particular veh. Best thing to do is get a repair manual and follow its guidance on removal and reinstallation of the heater core. Good Luck
2002 diamante heater core sits in center of the dashboard just over the on board computer for the car. To access it you need to take out the console between the seats and the entire dashboard to get to it. The only thing wrong with the heater core is the leaking gaskets (about $10 in parts). Mitsubishi knows about the problem and when the dash is taken apart you will see a plastic sheet over the onboard computer to somewhat protect it from the leaking heater core gaskets. So the expense in the repair is in the labor to get it all apart and back together again. The dealers seem to replace entire heater core when they fix this problem. I did just the gaskets and that solved the problem. I have read others who did it themselves only replaced the gaskets and that solved it for them as well. Maybe the dealers think you will feel better replacing a larger part for so much labor.