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Thread: AC Heat Controller

  1. #1
    Building Boost MSheff's Avatar
    Join Date
    Feb 2013
    Location
    Carl Junction, MO
    Posts
    73

    AC Heat Controller

    My blower motor comes on only when my selector (Defrost/Mix/Floor/Vent/etc.) is in the position shown in the picture. Anywhere else and the fan stops. So I suspect that selector would turn off the fan if the selector was all the way down in the Off position. So some switching of some sort is taking place through the selector somehow. Anybody have any ideas? Fixable?

    SVO Heater Control (2).jpg

  2. #2
    Moderator Meotchh's Avatar
    Join Date
    Jun 2011
    Location
    Seattle, Washington, United States
    Posts
    1,274
    Are there any splices in the harness or loose wires at the plugs?
    If not, try using some contact cleaner on the switches & cycling the switches.
    There's nothing more to see here, now move along...

  3. #3
    Half Boost
    Join Date
    May 2012
    Location
    Duncannon PA
    Posts
    513
    Like Meotech said. Is there any loose wires or splices?? Almost all of the controls are vacuum operated so there isn't too much electrical to go wrong.

  4. #4
    Building Boost MSheff's Avatar
    Join Date
    Feb 2013
    Location
    Carl Junction, MO
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    73
    This is a really late follow up, but wanted complete the thread. I took the controller out and the housing was cracked. As I moved controller up or down, it was not making contact. Squeezed it together and held together with some epoxy. All is good now.

  5. #5
    Building Boost
    Join Date
    May 2012
    Location
    San Mateo, CA
    Posts
    97
    Quote Originally Posted by MSheff View Post
    This is a really late follow up, but wanted complete the thread. I took the controller out and the housing was cracked. As I moved controller up or down, it was not making contact. Squeezed it together and held together with some epoxy. All is good now.
    Yes, that’s a common problem with the ac cars. The sliding block falls apart. It would be nice if a repair kit was invented. The controls were going for $150. Now headed for $200+

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