Silverado 1500

Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on Chevrolet Silverado 1500

Problem Description and Possible Solution

One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored in the HVAC control module should be available to assist with diagnoses.

Problem Data
RepairPal Verified
Average mileage: 122,497 (1,000–288,034)
13 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
275 people reported this problem
Viewing 1 - 20 of 125 comments
Drivers side AC will intermittently switch to heater. Only remedy once heat starts is to restart engine. Seems to happen after relative high speed and slow down, will kick off when acceleration resumes. Also seems to happen between 75-85 deg outside temp the most often. It has become major annoyance but expensive fix.
When you drive down the road the AC on the drivers side starts blowing out hot air. You have to stop and restart the truck for it to blow cold air again. The passenger side continues to blow cold air and is not affected. It started doing in one time a day but is now doing it four or five times a day. It is currently in the shop. He has replaced two Actuators at $126 each, but he says the problem has not been fixed. I will update this post after I pick it up.
I've changed the drivers side dual blend door actuator but the heat will intermittently blow hot to cold air. On the drivers side and the passenger side is completely fine. I'm really good with your regular mechanical problems but this electrical stuff has me lost on what to look for. Making it difficult to fix my issue.
I have no heat although the fan is working fine. One mid vent also produces no air. One heater line to the firewall from the engine is hot while the other is cold.
a/c and heat all comes out of defrost vent and cannot switch from hot to cold without shouting off engine for a little bit.
After a few minutes of working correctly the air stops blowing from the vents. Fan is working, and some cool air seems to be sneaking thru, but it appears the vent actuators are not working. Have not been able to remedy the problem yet.
Ditto. Occasionally the driver side air will go from AC to heat! Have to stop the car and restart it to get it to be AC again. Time to sell and buy a Ford.
Intermittent problem with driver side ac blows hot passenger side ice cold not all the time shut truck off 20-30 min. Later both sides blow cold.With ac and blower off still fill and fan off can still fill air blow slightly out of vents
The passenger side air blows only hot air, because the acctuator door is broken. I took the vents out and sealed them so that no air comes out of the passenger side vents. This is obviously not the best solution, but the acctuator is so hard to get to that it isn't worth it to me.
heat on the left side failed. replaced actuator, but unfortunately heater core failed at the same time so i had dto replace that too