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    #1

    AC shit the bed.

    Good evening all.

    Well, the AC in my 91 CV/P72 shit the bed last night. Compressor won't engage. In the last 2 years I replaced the compressor, drier, oraface tube and converted to 134. Drove it to work yestrday afternoon and it blew cold. No issues. Left work and the compresor won't engage. I checked the plug because the little clip is and has been broken since I got the car. Every once and a while the plug will work itself loose and pushing it back on does the trick.

    This time, not so much.

    Going to run a jumper from the battery to the compresor to check it, but in all honesty, I pretty sure it's good. Outside of the relay, what else do I need to be checking. Hi/Low pressure switch...

    I really need my AC here. Thanks.
    1991 LTD P72 351 W Restored Century Police (Ongoing Project) Sergeant Vic.

    It's a dog eat dog world and I'm wearing milk bone underwear.
    Tags: None
    #2
    Ok, found the problem. The high pressure line for the compressor was rubbing on the AC compressor bracket. Now it has a hole in it. Gotta find a shop that rebuilds those lines, or just buy a new one which ever is cheaper.

    Damn.
    1991 LTD P72 351 W Restored Century Police (Ongoing Project) Sergeant Vic.

    It's a dog eat dog world and I'm wearing milk bone underwear.

    Comment

      #3
      been there, done that..... AC hose my 88 MGM ruptured the first summer I owned it. installed a new hose, refilled with Freon and life was good.
      2003 Town Car Signature - 3.27 RAR, Dual exhaust and J-mod - SOLD 9/2011
      89 Crown Victoria LX HPP -- SOLD 9/2010
      88 Grand Marquis LS - The Original -- Totaled 5/2006

      I rebuild AOD/AODE/4R70W/4R75E transmissions....Check out my Facebook page: https://www.facebook.com/pages/North...48414635312478

      Comment

        #4
        buy a new hose. They're still available and not that expensive.
        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

          #5
          You might want to give the whole thing a onceover while the system is open, new orings, accumulator, orifice tube, valve stems, etc.

          Pete
          Originally posted by gadget73
          For other types of inquiry, more information is required. Please press 4 to speak to a representative who can help you with your question. This call may be monitored for quality assurance purposes.


          2003 Grand Marquis Ultimate, the "Stealth Bomber": http://www.grandmarq.net/vb/showthre...-Grand-Marquis
          1991 S-10, 'Bulldog', 2.5l 5 speed: http://www.grandmarq.net/vb/showthre...375#post698375
          1985 Town Car, 'Faded Glory', gone but not forgotten. 84/87/91/97 MGMs too.

          Comment

            #6
            I don't mean to jack a thread, but are the stock AC systems on these cars installed with pressure switch so that it won't engage the compressor if the refrigerant is low?
            '88 Lincoln Town Car '78 F250 Hi-Boy
            '80 XS850 '80 GS450 '82 XJ650 '81 XJ650 '81XS850 '82 XV750

            Comment

              #7
              yes. Later models also have a high pressure switch so if something gets clogged, it won't blow up.

              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

                #8
                Okay, thanks. Good to know.
                '88 Lincoln Town Car '78 F250 Hi-Boy
                '80 XS850 '80 GS450 '82 XJ650 '81 XJ650 '81XS850 '82 XV750

                Comment

                  #9
                  The switch on the 89 went a couple of weeks ago. It turns out that is a low and high cutoff switch.

                  I found out when the flap guy corrected me when I asked for a low pressure cutoff switch.
                  Last edited by jaywish; 07-18-2013, 07:45 PM.
                  03 Marauder DPB, HS, 6disk, Organizer Mods> LED's in & Out, M&Z rear control arms, Oil deflector, U-Haul Trans Pan, Blue Fuzzy Dice
                  02 SL500 Silver Arrow
                  08 TC Signature Limited, HID's Mods>235/55-17 Z rated BFG G-Force Comp-2 A/S Plus, Addco 1" rear Sway, Posi Carrier, Compustar Remote Start, floor liners, trunk organizer, Two part Sun Visors, B&M Trans drain Plug, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17
                  12 Escape Limited V6 AWD, 225/65R17 Vredestein Quatrac Pro, Winter 235/70-16 Conti Viking Contact7 Mods>Beamtech LED headlight bulbs, Husky floor liners

                  Comment

                    #10
                    flap?

                    as far as I know, the low pressure switch does not have a high pressure limit as it would just blow the pressure relief valve on the older systems (unless it's rusted solid).

                    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

                      #11
                      Friendly Local Auto Parts =FLAP

                      If I find the box in the garbage I will let you know, IIRC it was marked with the low & high limit.
                      03 Marauder DPB, HS, 6disk, Organizer Mods> LED's in & Out, M&Z rear control arms, Oil deflector, U-Haul Trans Pan, Blue Fuzzy Dice
                      02 SL500 Silver Arrow
                      08 TC Signature Limited, HID's Mods>235/55-17 Z rated BFG G-Force Comp-2 A/S Plus, Addco 1" rear Sway, Posi Carrier, Compustar Remote Start, floor liners, trunk organizer, Two part Sun Visors, B&M Trans drain Plug, Winter=05 Mustang GT rims, Nokian Hakkapeliitta R-2 235/55-17
                      12 Escape Limited V6 AWD, 225/65R17 Vredestein Quatrac Pro, Winter 235/70-16 Conti Viking Contact7 Mods>Beamtech LED headlight bulbs, Husky floor liners

                      Comment

                        #12
                        interesting... though that wouldn't do any good as a high pressure switch on the low side unless something was really screwed up.

                        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

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