Forum Discussion

lowreyfarris's avatar
lowreyfarris
Explorer
Jun 18, 2013

Dash vents not working

My class C on a 2007 Chevy Express will not blow out of the dash vents. The temp switch seems to be fine, I can change it from hot to cold, and the a/c will turn on and off. It seems like whatever needs to open to redirect the air is not working. It will only blow from the window (defogger) vents.

Any advice is greatly appreciated.

Thanks in advance
Class C
  • Bobbo's avatar
    Bobbo
    Explorer II
    Jun 24, 2013
    lowreyfarris wrote:
    There were two vacuum line harnesses on the passenger side near floorboard. One of them was disconnected, the one with only two lines, brown and yellow. I reconnected them and tucked them away. I guess my passenger hit them with his foot.

    Thanks again for all the help

    Lucky you. Mine was SEVERAL hundred dollars even though the chassis was still technically under warranty. Rodent damage is not covered.
  • IAMICHABOD's avatar
    IAMICHABOD
    Explorer II
    Jun 24, 2013
    Thanks for the update. It is nice to know that you got it fixed

    I also have a Chevy Class C but have not had this problem, but if I ever do I now know where to look.

    This forum always has good info and it is really nice when the OP of threads return and give a resolution to their troubles. With the help of others we all gain.
  • lowreyfarris's avatar
    lowreyfarris
    Explorer
    Jun 24, 2013
    There were two vacuum line harnesses on the passenger side near floorboard. One of them was disconnected, the one with only two lines, brown and yellow. I reconnected them and tucked them away. I guess my passenger hit them with his foot.

    Thanks again for all the help
  • j-d's avatar
    j-d
    Explorer II
    Jun 18, 2013
    Done any underhood work lately? We broke the vacuum line in a TBird changing the battery.
  • Grillmeister's avatar
    Grillmeister
    Explorer
    Jun 18, 2013
    j-d wrote:
    I think "Blend" is the door that balances heater core with air conditioning evaporator to produce your desired temperature. Not as sure of the name for "Mode Select" or whatever that part is, but I don't think it's same as Blend. Quite a few vehicles use Electric for Blend and Vacuum for Mode. Default is Defrost, so I'm with the crew that says it's a vacuum problem. Broken hose, cracked vacuum reservoir...
    X2
  • lowreyfarris's avatar
    lowreyfarris
    Explorer
    Jun 18, 2013
    Thanks for pointing me in the right direction. I am planning to work on it this weekend, and I will post an update when I am finished.
  • Bobbo's avatar
    Bobbo
    Explorer II
    Jun 18, 2013
    When mine did that it was a vacuum line that had been chewed by mice. No vacuum.

About Motorhome Group

38,707 PostsLatest Activity: Feb 28, 2025