Heater blowing cold air
2011 gmc terrain slot blower works fine but air is cold even when temperature is turned to the highest temp. Even long after car has warmed up.
Vehicle Parts & Accessories - GMC - Air Conditioning and Heat for GMC Terrain
Answers & Comments
Sounds like thermal blend door motor is stuck or locked up need to rotate switch an listen if blend door motor moves that model has drivers side an pass side blend door motors
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You have a plugged heater core.