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No heat, random heat, w/ATC. ARG!

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    #31
    in that case it's probably some electromigration in a chip or transistor causing crap.

    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.

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      #32
      No cracked solder joints? I've fixed a number of various vehicle failures caused by solder joints forming very small cracks. Usually it shows up with intermittant problems that are occasionally temperature dependant.
      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

      Everything looks like voodoo if you don't understand how it works

      Comment

        #33
        Originally posted by gadget73 View Post
        No cracked solder joints? I've fixed a number of various vehicle failures caused by solder joints forming very small cracks. Usually it shows up with intermittant problems that are occasionally temperature dependant.
        Well, none that I could see. I guess I didn't look closely at every single joint. The slider may have had an issue with one of the joints--it looked a little dirty. I just figured that was the old rosin, but perhaps it was a bad joint, I dunno. It's back together now, but if I get a chance, I'll look it over again...
        1990 LTD Crown Victoria LX. As stock as the day it was born.
        16" HPPs sitting in the garage. That's it for now...kids gotta eat.

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          #34
          I registered to share a post I made on another site

          I helps this helps people as my present issue is different in that, ALL my HVAC functions are Normal. The only issue I have with my MGM is the NO HEAT even though both my heater hoses are hot.
          Again, ALL ATC functions are working except warm air being delivered.

          I started the car today and within 3 minutes I feeling a slight amount of warm air which disappeared in 2 minutes and turned to cold cold

          The 92 Mercury and Crown Victoria have a Unique blend door atuator and is NOT the same as other years.
          The Motorcraft service number is YH-1766
          as you read the link below you will see parts number updates and pricing from Obsolete to new

          1992 Marquis NO HEAT Problem - Mercury Forum - Mercury Enthusiasts Forums
          http://www.mercuryforum.com/forum/showthread.php?t=5221
          Grand Marquis - 1992 Marquis NO HEAT Problem - When everything on the ATC system except for NO HEAT to Interior, the problem is usually the Electronic Blend Door Actuator Notice on this CV that the parts and placement are pretty well the same....




          Last edited by Mil1ion; 12-25-2010, 09:47 PM.

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            #35
            The ambient interior temp sensor when faulty will default to HEAT not cold

            Only when it is replaced and working will cool AC air be available.

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