Passenger Side Heat/AC

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Mark Schad

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2nd Gen Owner
V8 Engine
Joined
Jan 19, 2016
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Rapid City, SD
The passenger side of my 09 switches back and forth from heat to a/c randomly. I have searched and found a lot of post on the blend doors not working, or only coming out defrost vent etc. This (my) problem occurs no matter what setting I have it on; Heat, A/C, vent, floor etc. Drivers side works perfectly, only passenger side has the problem.



Any help or suggestions would be appreciated greatly.



Mark
 

Mark Schad

Member
2nd Gen Owner
V8 Engine
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Jan 19, 2016
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Location
Rapid City, SD
I should have also mentioned, you can sometime hear what I am assuming the blend door moving when it switches from heat to a/c or a/c to heat.
 

Shawn Ford

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V8 Engine
4 Wheel Drive
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Nov 18, 2019
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Indianapolis, IN
I have a similar issue and also can hear the vacuum release when engine shut off and when let off of gas pedal. Not sure if hearing the vacuum is an issue or not. I took the canister under the glove box out and it seems fine no cracks or anything. But my passenger side is sometimes not what I have selected for temp. It blows out the correct direction, face,floor,both etc
 

Todd Z

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2nd Gen Owner
V6 Engine
V8 Engine
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There is a temp sensor for each side, it may need cleaning. Drivers is on the right of the steering wheel, I think the pass is by the radio or side of the glove box.
 

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