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No vaccum to the controler

Discussion in 'Chevy Trucks' started by rgrimes945, Feb 10, 2007.

  1. rgrimes945

    rgrimes945 Senior Member
    Messages: 134

    My problem is I can't get the defrosters or anything else to work blower works good just can't get the air to move around.

    Ray Grimes
     
  2. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    What truck? If it's one of the 80's Chevy's in your sig I can help. Did this problem just start or did you buy the truck this way? How did you determine that you have no vacuum at the heater controller?
     
  3. rgrimes945

    rgrimes945 Senior Member
    Messages: 134

    heater problem

    it was like that when I got it. I replaced the controler but it did nothing to help it and yes it's an 85 chev 4x4 k 20
     
  4. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Ok, since the HVAC system on this truck is vacuum controlled then this has to be a A/C equipped truck. If you have no vacuum at the control panel the first thing to check is the vacuum supply hose under the hood.Look around on the firewall for the vacuum reservoir canister.It's a black plastic round shaped thing about the size of a softball.Once you identify it, look on it for TWO vacuum line's.One come's off the canister and goes through the firewall and inside the truck.The other should run along the firewall and go to the intake or carb base on the engine.This is the line that feed's vacuum to the control system.Many of these line's get disconnected and forgotten during an engine swap so they may not even be there so that may be your whole problem.If the line is there on the engine, it may just be connected to an incorrect port.It need's constant engine vacuum to work and if it's hooked to ported vacuum instead it won't work properly.
     
  5. rgrimes945

    rgrimes945 Senior Member
    Messages: 134

    checking

    ok, I'll look at that in the morning and see if thats my problem.
    Ray