How to fix Hot Air when A/C is on. Install new air mix/blend door actuator

Discussion in 'Tech Info' started by WHITEOUT, Jun 23, 2010.

  1. SmokChsr

    SmokChsr TYF Newbie

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    One side note to this.. Until you replace or repair the actuator, you can usually turn off and on the motor and it will go back to cold when it does the reset. It also helps to keep the temp set to the lowest setting so the computer doesn't try to reposition the blend door and it stays on full cold.

    Mine is currently in need of attention, but being lazy, I just work around it for now. So I'm quite experienced at restarting when needed.

    The cause of the problem is the position sensor in the actuator (a variable resistor) is dirty and not making good contact. While I havn't done it myself (yet) I've seen it said that you can open and clean that resistor and it'll work fine again.
     
  2. SmokChsr

    SmokChsr TYF Newbie

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    Just a though, make sure you can operate the blend door manually. It could be that it's got some trash in there that's keeping it from moving properly.
     
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  3. Rick Can

    Rick Can TYF Newbie

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  4. Rick Can

    Rick Can TYF Newbie

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    My '05 Tahoe has the center console that goes under the dash. Does all that housing have to come out to get the actuator?
     
  5. Sam Harris

    Sam Harris Full Access Member

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    I have had this problem since I picked up my '03 Yukon a couple months ago. I ordered, and easily replaced the HVAC Control Module, though it was hard to find, and about $80 from Summit.
    Unfortunately, after replacing, I still had only hot air in the rear HVAC unit. I found the blend actuator door is broken, and there is a large piece inside the unit. Unfortunately, I can't seem to find the replacement part handy. I found: 15-5717, but this part seems to be listed for only the Yukon XL, and I don't want to order the wrong part. (I already wasted $80 on the module that was not the problem!) I also had to take the entire unit apart, and there's always that one bolt that prevents you from getting it done right... I have one that attaches the rear of the auxiliary HVAC unit to the body, right in the back of the unit, and access is from underneath. I got a long extension on there, but it seems to be just spinning the bolt and nut. Getting the pieces lined up in the unit, while still in the vehicle appears to be an impossible task..
     

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