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Vacuum can in cowl

Discussion in 'The Garage' started by DwarF, Sep 17, 2004.

  1. DwarF

    DwarF 1/2 ton status

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    There is a vacuum canister inside the cowl. Not in the engine compartment, not in the cab, and not under the truck, but inside the cowl on my 1983. What is this for?
     
  2. mosesburb

    mosesburb For Rent Premium Member GMOTM Winner

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    It closes the plenum valve when the Max A/C setting is selected, thus not allowing outside air in. When this valve closes the valve in the RH kick panel opens allowing the bolwer to take air from inside the cab.
     
  3. DwarF

    DwarF 1/2 ton status

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    Thanks mosesburb.

    Does anyone have a diagram of the vacuum hose hookups?
     

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