Try warming the Vehicle, then carefully feel the heater hoses, are they both hot? If one is cooler than the other, You need to flush the core, or a replacement job on the heater core. Also if the system has a heat control valve on the heater hose, make sure it is working!
Or if it's auto temp, a blend door could be stuck.
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Tuesday, December 25th, 2007 AT 7:23 AM