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    #1

    Heater is tempermental

    The heater in my 88 TC has been acting strange since I got it. When I turn the heater on all the way, at first it will be really hot. then, the A/C turns on and it's really cold, and it won't go back to heat. When I turn the car off and back on, it might be hot, or the A/C might still be blowing. When it sits for more than a couple hours, it goes back to being hot for a minute then A/C comes on again. What the hell is going on? I've replaced the switches in the dash, and it didn't help.

    "No other man-made device since the shields and lances of the ancient knights fulfills a man's ego like an automobile." -Sir William

    2011 Lincoln Town Car Signature Limited- Black on black, ADTR sway bars, 19" Mustang GT rims, Heinous rear control arms, dual exhaust with Flowmaster 10 series mufflers. MHS Stage 2 heads/cams, 80mm MAF, 75mm BBK throttle body, Accufab plenum, Stainless Works long tube headers, Ford Racing 24# injectors. ADTR T56 swap with Hurst shifter. 264HP/298TQ at the rear wheels.
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    #2
    You mean the compressor kicks on and it gets icy cold??? thats odd...

    Its common for the ATC sniffer to go bad and act like that, but usually only gets as cold as outside air.
    You can replace the sniffer or for full blast heat pull the vacuum hose (and plug it) for the blend door, located right behind the glovebox.
    Other options include plumbing in a vacuum regulator valve you can control for the blend door, or de-volving to non-ATC, which no one here has done that I know of.
    Last edited by 85crownHPP; 09-03-2009, 07:47 PM.
    Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
    'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
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    85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereo

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      #3
      ? I am not good at interior work. I would not have any clue how to do that.

      "No other man-made device since the shields and lances of the ancient knights fulfills a man's ego like an automobile." -Sir William

      2011 Lincoln Town Car Signature Limited- Black on black, ADTR sway bars, 19" Mustang GT rims, Heinous rear control arms, dual exhaust with Flowmaster 10 series mufflers. MHS Stage 2 heads/cams, 80mm MAF, 75mm BBK throttle body, Accufab plenum, Stainless Works long tube headers, Ford Racing 24# injectors. ADTR T56 swap with Hurst shifter. 264HP/298TQ at the rear wheels.

      Comment

        #4
        And yes, the compressor kicks on by itself.

        "No other man-made device since the shields and lances of the ancient knights fulfills a man's ego like an automobile." -Sir William

        2011 Lincoln Town Car Signature Limited- Black on black, ADTR sway bars, 19" Mustang GT rims, Heinous rear control arms, dual exhaust with Flowmaster 10 series mufflers. MHS Stage 2 heads/cams, 80mm MAF, 75mm BBK throttle body, Accufab plenum, Stainless Works long tube headers, Ford Racing 24# injectors. ADTR T56 swap with Hurst shifter. 264HP/298TQ at the rear wheels.

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          #5
          Do you have it in defrost when this happens by chance? that would explain the compressor.
          Next time it happens, open the glovebox and reach through it on the left side and feel around for a 3/8"ish vinyl feeling hose attached to a round grey-ish cylinder, and pull it off, see what happens. You should get full heat if the car is warmed up.
          Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
          'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
          sigpic
          85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereo

          Comment

            #6
            Only positions the compressor can run in are AC, defrost, and mix. The hot to cold thing is quite possibly an ATC sensor but the compressor kicking in is most likely the control lever in the wrong position.
            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

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              #7
              I'm having a similar problem with my '05 GM....

              A few days ago the heat wouldn't kick on then finally it did nice and toasty. Now when I turn the control to AC, the system blows lukewarm slightly humid kinda moist air. The compressor clicks on. The evaporator is functioning normally as evident by the puddle under the car.
              It's like I've got a vaccum leak somewhere in the controls and a door in the duct work isn't closing. Right now Atlanta is still hot enough in the day time to need AC but cool enough at night that light heat is nice to defog the windshield.
              Nothing makes me smile more than a cougar in my Panther

              Kristal - 2005 Grand Marquis GS

              Killin' zombies and grillin' veggie burgers, it's kinda my thing you know? - Bozowolf

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                #8
                Newer cars are a totally different animal. They have electronic controls and a blend door servo motor that fails, along with this funny module that handles fan speeds. Might want to run the eatc self-test. Not sure the procedure on an 05, but it should be in the shop manual.
                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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