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.
Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on Chevrolet Silverado 1500
Average mileage: 127,639 (1,000–1,000,000)
161 people reported this problem
112 people shared problem details
ac blows hot air on drivers side, have to pull over and restart the engine this sucks big time
Left drivers side vents blowing hot air when ac on..... passenger side blowing cool air
2004 Chevrolet Silverado 1500103,000Visitor
Heat on all the time, can not turn off
2005 Chevrolet Silverado 1500100,000Visitor
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.
2003 Chevrolet Silverado 1500175,500Visitor
Driver cold passenger side hot..plz help
2002 Chevrolet Silverado 1500199,236Visitor
can not change air delivery from floor outlets
1999 Chevrolet Silverado 1500116,000Visitor
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.
2000 Chevrolet Silverado 1500206,000Visitor
ac and heat doesnt work,fan worksin three of four speeds.
2007 Chevrolet Silverado 1500120,000Visitor
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.
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.
2004 Chevrolet Silverado 1500150,000Visitor
ac & heat only blow out defroster
2004 Chevrolet Silverado 1500121,000Visitor
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.
2003 Chevrolet Silverado 150085,000Visitor
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.
2007 Chevrolet Silverado 1500107,008Visitor
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.
2003 Chevrolet Silverado 1500134,562Visitor
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
2004 Chevrolet Silverado 1500123,000Visitor
heat wont come out on the floor on drivers side works on dash but not the floor
2004 Chevrolet Silverado 1500129,000Visitor
heat on the left side failed. replaced actuator, but unfortunately heater core failed at the same time so i had dto replace that too
1999 Chevrolet Silverado 150038,000Visitor
driver side has heat and cold, passenger side ac and no heat
2000 Chevrolet Silverado 150040,000Visitor
It's either on cold or hot. There's no middle ground
2004 Chevrolet Silverado 150085,000Visitor
Blows hot and cold air
tow haul mode not working
Heat sometimes blows cold air
And it makes no difference weather the temperature selector is set to heat or ac
Have dual controls. Everything working fine; then all of a sudden my driver's side will blow ou...