question about...1973 mav.

Discussion in 'Technical' started by 71gold, Nov 6, 2019.

  1. 71gold

    71gold Frank Cooper Supporting Member

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    need to know on a 73' A/C 250 car where the ...heater control valve gets its vac.

    thanks for any help... :Handshake:
     
  2. Craig Selvey

    Craig Selvey Indiana State Rep - MCCI

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    It will be a vacuum hose coming thru the big black plug on the firewall. The other hose thru that firewall plug goes to the vacuum canister.
     
  3. 71gold

    71gold Frank Cooper Supporting Member

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    ...:Handshake:...

    Jeff showed me a digram last night (thanks Jeff) that has a brown hose to the valve, it said "partial vac.". would you know if that's full vac. at startup and drops it when turning the heat on.
    I found a heater valve that with full vac. the valve is closed and the water loops back to the block. when vac. is dropped it opens and water goes to the heatercore.
     
    Last edited: Nov 7, 2019
  4. Craig Selvey

    Craig Selvey Indiana State Rep - MCCI

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    I really don't know the ins and outs of these valves and the vacuum system. I just hook up the colored coded vacuum hoses where they go and it works. :D
     
    Krazy Comet, 71gold and Maverocket like this.
  5. CA189HJN

    CA189HJN Robert Couse-Baker Supporting Member

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    There is a vacuum reservoir (black coffee-can-shaped thing under the fuel carbon canister, next to the starter). This device and it's check-valve ensure the climate control has vacuum when the engine is producing little vacuum, such as under acceleration. If yours is original, it's likely gone bad. I'll send you the test procedure for the vacuum reservoir, if you wish.
     
  6. 71gold

    71gold Frank Cooper Supporting Member

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    I'm good...:Handshake:
     

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