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    90 may or may not be vacuum actuator. They changed to electronic controls in the late boxes, pretty sure 91 was electronic, I think '90 may be as well. If it is, none of the vac stuff applies.

    Honestly that sounds more like low coolant or some sort of restriction in the core. A vacuum leak won't cause it to do that.
    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC grandpa spec white and cranberry

    1984 Lincoln Continental TurboDiesel - rolls coal

    Originally posted by phayzer5
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

    Comment


      It is now barely putting out any heat. Even at highway speeds. Coolant level is up. Any other ideas?

      Thanks
      Tim
      2000 Ford Crown Victoria
      84 Lincoln Town car signature, R.I.P
      85 Ford LTD Crown Victoria 2 door performance project
      89 Lincoln town car: RIP
      89 Crown Victoria LX 2002 USACi sound quality world champion RIP
      1990 Mercury Grand Marquis LS
      1994 Mercury Grand Marquis (sold)
      2004 Mercury Marauder. owned for a week then got screwed by the dealer

      Comment


        blend door not moving fully to hot or clogged heater core. Assuming the engine comes up to a decent temp.

        Clogged core is easy to check. If one hose is hot and the other is cold, its not moving any water. Both should be pretty hot. If neither are hot the engine isn't coming to temp or the core is so clogged water won't even move through it.
        86 Lincoln Town Car (Galactica).
        5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

        91 Lincoln Mark VII LSC grandpa spec white and cranberry

        1984 Lincoln Continental TurboDiesel - rolls coal

        Originally posted by phayzer5
        I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

        Comment


          Could also be dirt/dust/mud/grime clogging the fins of the heater core and not allowing flow through it.

          Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
          rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)

          Originally posted by gadget73
          ... and it should all work like magic and unicorns and stuff.

          Originally posted by dmccaig
          Overhead, some poor bastards are flying in airplanes.

          Comment


            Excellent info. Thank you.
            All FORD All The Time

            Comment


              if the fins are packed with dirt it won't move much air through the vents.
              86 Lincoln Town Car (Galactica).
              5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

              91 Lincoln Mark VII LSC grandpa spec white and cranberry

              1984 Lincoln Continental TurboDiesel - rolls coal

              Originally posted by phayzer5
              I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

              Comment


                It wound up being the whole control unit. replaced it works great now.

                Tim
                2000 Ford Crown Victoria
                84 Lincoln Town car signature, R.I.P
                85 Ford LTD Crown Victoria 2 door performance project
                89 Lincoln town car: RIP
                89 Crown Victoria LX 2002 USACi sound quality world champion RIP
                1990 Mercury Grand Marquis LS
                1994 Mercury Grand Marquis (sold)
                2004 Mercury Marauder. owned for a week then got screwed by the dealer

                Comment


                  When driving and I steer the vehicle around a left turn ATC blows hot, around a right turn the ATC blows cold - I'm guessing bad AATS sensor or the blend door has separated from the line since it's switching hot/cold based on vehicle steering? Haven't dug into it yet since I usually just ventilate with the windows down.

                  On my car I've plugged off the parking-brake release vacuum line since the switch leaked. I wonder if I could repurpose that line to the blend door with my own valve to control hot/cold.

                  Comment


                    be easier to just use the existing line to the temperature controller, but replace the temp control with your own valve. If you pull the top of the dash off you'll find the whole works there, cable from the slider, vacuum line in, and vacuum out to the servo. Connect those bits up as appropriate and you can control the door without having to drag a hose from one side of the car to the other.


                    If the temp flops with steering, might just be the servo somehow got unhooked. If I remember right that door is welded to the actuator rod so while not impossible for it to have broken loose its not the first thing I'd suspect. On the top side though I think the arm comes out in roughly a Z shape and the arm of the vac servo just slides over it. I think there is a push clip of some fashion on top of it to hold it all together. If that popped off you may have the vac servo arm not connected to the blend door arm. Should be able to get a mirror or something in there to see whats going on.
                    86 Lincoln Town Car (Galactica).
                    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                    91 Lincoln Mark VII LSC grandpa spec white and cranberry

                    1984 Lincoln Continental TurboDiesel - rolls coal

                    Originally posted by phayzer5
                    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                    Comment

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