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Heat Control Valve Under Hood 700 1990

posted by  msk on  Wed Nov 27 08:53 CST 2002
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My question is what controls the heat control valve under the hood near the firewall?? The heat seems to work okay but the valve on the outside stays in one position (I assume it's open). I checked for vacuum on the hose seems low if any. Is there another valve inside buried in the dash?? Should this valve move with the slide control?? 1990 745T 95k miles.








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    Heat Control Valve Under Hood

    posted by  runwld2 on  Fri Nov 29 03:45 CST 2002
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    last visit: Tue Sep 30 13:11 CST 2014
    [RELATED]

    This underhood valve many times does not close fully and allows some heating in the summer.
    --
    744-16v,745-16v,242Turbo.245DLT








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      Heat Control Valve Under Hood

      uid 55's pic
      posted by  john sargent on  Fri Nov 29 04:51 CST 2002
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      last visit: Wed Oct 22 09:07 CST 2014
      [RELATED]

      This can be almsot completely controlled through adjustment of the sliding temperature lever under the dashboard. See this old post from the archives:

      http://www.brickboard.com/ARCHIVES/2000OCT/20106022.shtml








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    Heat Control Valve Under Hood

    posted by  someone claiming to be steve on  Wed Nov 27 10:53 CST 2002 [RELATED]

    The heater control valve is controlled by vacuum applied through the heater control inside: when the temperature selected is at all above cold as determined by the slide or rotary control, the valve opens.

    The slider controls the air mixing door.







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