Floor Heat Works But Defrost Does Not 2006 Gmc Sierra

I have tried the pulling the fuses both under hood and left of dash but that did not fix my problem.

Floor heat works but defrost does not 2006 gmc sierra.

Ac heater fan not responding to switch in 2007 sierra. On my 2006 gmc sierra the a c heater mode stays on vent even when changing the control to the floor or defrost positions. 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. 724 great deals out of 33 084 listings starting at 1 999.

2006 gmc sierra w dual auto climate control. Heat cold works fine. 2006 slt 4x4 no floor heat 2 answers. Once defrost is selected the blower motor keeps spinning but the top vent won t open.

I have a similar problem. 2006 gmc sierra 1500 4x4 heat or a c won t switch from dash vents. Used gmc sierra 1500. Carmakers have used this basic design for 100 years.

I didn t notice anything on the way home i was still in 400 00 shock but today i noticed it. Retg mentions above that he has diagnostic charts. 2000 silverado 5 3 4x4 my hvac actuator mode valve does not work. All frontal vents and floor vents work fine and can be switched between without problems.

The only issue arises when you go to put it to defrost. No output on dash face vents or defrost vents but floor works ok. Fan only blows defrost won t change to floor or vent. As a new user and first post i am unable to email him.

Loss of hvac system mode and or temperature control replace hvac control module 04 01 39 007 06 17 2004 models. How do i replace it. 2006 dodge ram 1500. Heat won t transfer from vent to floor when put on floor heat blows from defrost.

Yesterday on way to brake shop it was working just fine. Also the highest fan speed does not work all other speeds are ok. 2002 cadillac escalade escalade ext. I only have air at the vents no defrost or heat at floor.

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