Audi TT no heat, repair and explanation. Dash out of the vehicle. Diagnosis in description
This Audi TT came into the shop with not heat. First check was to see if the engine was coming up to temperature, engine temperature would not come above 165*F. While this is plenty warm for the system create heat, it was a sign that the thermostat was stuck open to some extent. Replaced the thermostat and water next, confirmed old thermostat partially stuck open. Retest vehicle, luke warm air then came from defrost but all other vents cold. Verified that blend door was functioning by switching between hot and cold, watching actuator, and listening for any changes in air flow. Found traces of insulating foam in vents, all this indicating the insulation has come off of the hvac doors thus not allowing them to redirect air as designed. Video shows dash removed and hvac doors missing insulating foam.