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2008 gmc envoy_sle
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7 Posts
Discussion Starter #1
I have 2008 Envoy and when I turn the control knob for floor heat the blower stays on window defrost.It does blow out the dash board vents when I turn knob for that.It only doesn't switch over to floor.Is there a solenoid that controls blower direction?
 

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2004 gmc envoy_slt
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2,249 Posts
Yes the is a part called a Mode Actuator that controls the air flow within the HVAC system. But I'm wondering since you have air flow to the windshield area, maybe there is another actuator (Defrost Actuator) that is also bad. Before replacing any parts, do the recalibration procedure to reset the actuators. Do a search on HVAC recalibration.
 

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2008 gmc envoy_sle
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7 Posts
Discussion Starter #4
So I finally went through the recalibration procedure and I still have no blower to the floor.When I have control knob on defrost and/or dashboard it works fine but when I ask for floor heat/cool the blowers comes out 1/2 defrost and 1/2 vent..Is there a seperate actuator for floor vent or does one actuator control all locations?
 
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