1999 Infiniti M45 Ac Working Perfectly Heat Working Mechanic Changed Thermostat

1999 INFINITI M45
91,000 MILES
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NANA1997
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AC working perfectly but the heat is not working. The mechanic changed thermostat but the same problem continue. Another mechanic suggested it may be the heater core, but he is not sure. I am confuse, please advice. Thanks.
Dec 8, 2012 at 8:42 AM
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