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HVAC System Question - Vents Stuck ?


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Good Evening All,

 

I have a 2008 Ford Edge , Dual Climate Control ... Here's my issue -

 

I am able to change temperature up and down, works flawlessly ... The problem is that the air is stuck flowing thru the front vents and floor, it will not change. I have tried to set onto the windshield it won't work , tried to set to just the floor and it still blows thru the front vents and floor, its essentially stuck in that position.

 

I originally thought it may have been the control unit , ran up to the car yard and grabbed another unit, installed and same issues .

 

I am somewhat perplexed. As mentioned, I can adjust the temp settings , but the flow of air is stuck...

 

any thoughts? possibly the actuators?

 

any insight would be greatly appreciated.

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One more thing I noticed , both on the control unit that was in the car and the second one I put it , once I hit the front defroster button , the small light on the control unit turned on, and no matter what other button I would hit , that windshield defroster light stayed on ...

 

Maybe I should try to leave the battery disconnected for a while

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First, check for codes, as outlined in the attached document. That may provide direction. Pinpoint Test J is I believe what you will be working with.

 

Also verify that the coolant, with engine off & "cold", is at the COLD FULL mark or slightly above. Verify the A/C refrigerant pressures also, the system may be low or have a leak. All kinds of weird behavior can happen when either of these two items are in question.

2008 Edge HVAC Module — Dual Automatic Temperature Control _DATC_ — Diagnostic Methods.pdf

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I was using the OBDLink MX , didn't show any codes.

 

Haven't tinkered with it just yet, but just noticed it won't switch to any other settings. Whether I want floor only, or whatever other setting it is just stuck on the combination of floor and main vents ...

 

Frustrating , considering the temp controls work ....

 

More worried in the winter when I need the windshield defrosted than I am now

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Why don't you try running the HVAC module in the diagnostic mode and see if it spits out any DCT's.

 

Press the OFF button and DEFROST buttons simultaneously, then release and press the AUTO button within two seconds. You should see flashing bars and then the DTC codes will appear.

 

On mine (just did thes to make certain that I had the right combo) I am seeing 88 88 as the codes (no codes displayed,my system is working perfectly. 88 88 is end code). Afterwards, press the DEFROST button to put the system back into opetation.

 

It sounds to me as if the HVAC Control Module is at fault. (Did you check all fuses related to the HVAC system)?

Edited by enigma-2
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thanks so much.

 

I will start with the blend door motor located by the glove box , it seems easily accessible.

 

I believe there are few more other than this one, but hopefully this is the one.

 

is there also one on the drivers side ?

 

will keep everyone updated

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