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1985 Grand Marquis heat problems, Full cold no heat!

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    #16
    I want to reactive this old Topic because I think my temp sensor is bad too. …

    It is heating until I change the temp settings, after this it wont heat anymore! So I wanna exchange the temp sensor under the dash but I can't find the replacement Motorcraft YH409 sensor anywhere! Is it still avaliable?

    Thanks,

    Gerald
    1988 Lincoln Town Car
    1975 Lincoln Continental Mark IV

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      #17
      Nope. No longer available. Check the corrugated hose going down to the firewall behind the glove box (accessible underneath). If that's come disconnected, it'll do weird stuff like that. It should plug into a nipple on the air plenum.

      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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