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.

Floor heat works but defrost does not 2006 gmc sierra.

Gmc 2006 sierra 1500 2wd question. Ac heater fan not responding to switch in 2007 sierra. No output on dash face vents or defrost vents but floor works ok. Fan only blows defrost won t change to floor or vent.

Loss of hvac system mode and or temperature control replace hvac control module 04 01 39 007 06 17 2004 models. Used gmc sierra 1500. I have tried the pulling the fuses both under hood and left of dash but that did not fix my problem. I didn t notice anything on the way home i was still in 400 00 shock but today i noticed it.

The temperature door diverts air over the evaporator for cool air or points the flow over the heater core for warm air. I ll try these remedies but just curious about a brake job ac connection. Yesterday on way to brake shop it was working just fine. 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.

The only issue arises when you go to put it to defrost. Heat won t transfer from vent to floor when put on floor heat blows from defrost. Carmakers have used this basic design for 100 years. Stuck won t switch to defrost of floor.

2000 silverado 5 3 4x4 my hvac actuator mode valve does not work. 724 great deals out of 33 084 listings starting at 1 999. 2006 slt 4x4 no floor heat 2 answers. How do i replace it.

Retg mentions above that he has diagnostic charts. On my 2006 gmc sierra the a c heater mode stays on vent even when changing the control to the floor or defrost positions. As a new user and first post i am unable to email him. 2006 gmc sierra 1500 4x4 heat or a c won t switch from dash vents.

Also the highest fan speed does not work all other speeds are ok. All frontal vents and floor vents work fine and can be switched between without problems. I have a similar problem. Heat cold works fine.

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