Floor Heat Works But Defrost Does Not 2006 Gmc Sierra

Gmc 2006 sierra 1500 2wd question.

Floor heat works but defrost does not 2006 gmc sierra.

Once defrost is selected the blower motor keeps spinning but the top vent won t open. Used gmc sierra 1500. Ac heater fan not responding to switch in 2007 sierra. The temperature door diverts air over the evaporator for cool air or points the flow over the heater core for warm air.

The only issue arises when you go to put it to defrost. 2000 silverado 5 3 4x4 my hvac actuator mode valve does not work. As a new user and first post i am unable to email him. I have tried the pulling the fuses both under hood and left of dash but that did not fix my problem.

Fan only blows defrost won t change to floor or vent. I didn t notice anything on the way home i was still in 400 00 shock but today i noticed it. Heat cold works fine. On my 2006 gmc sierra the a c heater mode stays on vent even when changing the control to the floor or defrost positions.

Yesterday on way to brake shop it was working just fine. All frontal vents and floor vents work fine and can be switched between without problems. Stuck won t switch to defrost of floor. How do i replace it.

Carmakers have used this basic design for 100 years. 2006 dodge ram 1500. No output on dash face vents or defrost vents but floor works ok. Retg mentions above that he has diagnostic charts.

I only have air at the vents no defrost or heat at floor. Loss of hvac system mode and or temperature control replace hvac control module 04 01 39 007 06 17 2004 models. I have a similar problem. 724 great deals out of 33 084 listings starting at 1 999.

2002 cadillac escalade escalade ext. Also the highest fan speed does not work all other speeds are ok. 2006 slt 4x4 no floor heat 2 answers. The blend door diverts the airflow to the defroster vents in the upper dashboard the floor discharge for heat or the center vents for air conditioning.

I ll try these remedies but just curious about a brake job ac connection.