QUOTE(montego @ Jul 8 2008, 06:36 PM)
first of all your car should be under warranty. the heater matrix is just like a very small radiator that is fitted inside the heater assembly, it's purpose is to radiate heat into the car if you have the heater on, you need to have your cooling system pressure tested at your dealer to check for any leaks, if the matrix is leaking it will mean removing the dash so that the heater can be removed and the matrix replaced, this is not an easy job and is best left to your dealer and it would be covered by your warranty
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