It could also be the heater core. It would have a bit of antifreeze smell, but that's a classic sign of impending heater core failure. If you let it go too long, you'll have a nice lake of antifreeze on you passenger floor.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
1987 928 S4 - Granite Green Metallic (Felsengrun)
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