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    #1

    low pressure cycling switch adjustment....

    The A/C on my car cools, but doesnt get cold. I have read about adjusting low pressure switch.
    whats the object here ? do I want to adjust it so the pressure is lower? currently it cycles to about 22-25 psi on the low side.
    which way do I turn the adjuster?
    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
    Tags: None
    #2
    r-12 or r-134a?
    sigpic'86 GM LS sedan bone stock 113k triple dark sable, most of the bells and whistles, second owner. SOLD 9/10, will be looking for an 89 TC when the time is right

    "In order to know virtue, we must first acquaint ourselves with vice" Marquis de Sade

    Comment

      #3
      134
      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
        got gauges on the car now .... low side goes to 30psi and no lower.

        is the system overcharged? or do I need to adjust the cycling switch.
        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

          #5
          after running for 10 mins the low side goes up to 40 psi and stays there, no matter what I do. I have adjusted the switch in both directions, bled off freon and added freon, it makes no difference, sits at 40 psi on the low side.

          this compressor is noisey, wondering if it has a problem. I just replaced it last summer.
          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

            #6
            Hey eric,
            is this similar to my a/c?
            or is my pos just not blowing worth a crap?
            does anybody else have this problem or heard of it?
            1986 Mercury Grand Marquis Colony Park A.K.A "Christine"TRADED.......Gone to a better home hopefully.


            2009 Ford Taurus SEL New DD

            Comment

              #7
              dude... why you hi-jacking my thread !!! ???
              go make your own thread.

              but answer your question, its completely different problems.
              On your car the A/C system is cooling, but very little air is blowing out of the vents. On my car the A/C system is NOT cooling as it should, but it blows air out of the vents slightly better than your car.
              Good Year broke the heater box in your car, and its not sealing properly to the fire fall or to the rest of the duct work.
              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

                #8
                Messing with the switch just lets the pressure get lower before the compressor kicks out. Usually R134 is a little happier cutting out at 20, where R12 wants about 25-28. If you're at 40, then messing with the switch won't do squat. High pressure on the low side sounds like the compressor isn't making proper suction, or its way overcharged. What are you seeing on the high side? If its not over about 250 with decent airflow, I'd have to wonder about that compressor. If its over 250, then it sounds like it may be overcharged.
                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

                  #9
                  yeah.. I am leaning towards a faulty compressor. High side is right around 250 psi.
                  I played with it some more and low pressure went up to 45 psi now, air out of vents is a dismal 60 degrees.

                  guess its time to order a new compressor... Again
                  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

                    #10
                    $400 later.... I have a new compressor, dryer and orifice tube coming.

                    also got a new fan clutch for 86merccp's car.
                    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

                      #11
                      friggin junk parts

                      1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
                      2006 Lincoln Town Car Signature. Stock for now
                      1989 Ford F-250 4x4 much much more to come, sefi converted so far.
                      1986 Toyota pickup with LSC wheels and 225/60/16 tires.
                      2008 Hyundai Elantra future Revcon toad
                      1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)

                      please be patient, rebuilding an empire!

                      Comment

                        #12
                        What kind did you get this time, and what brand was the old one ?
                        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

                          #13
                          The last compressor came from some on-line discount/close out place. it was supposed to be a AcDelco reman, but was something different in the box. it had Ford stampings on the metal case and appeared to be new. I used a cheap, aftermarket dryer from the parts store that was much shorter than the factory unit. I had to modify the bracket for the low pressure switch to clear with the shorter dryer installed.

                          this time I wanted an name brand compressor, the MotorCraft compressor doesn't come with a clutch and it was rather pricey. the clutch pieces are sold separately and almost as much as the compressor. AcDelco units seem to be decent quality, but I wasn't able to find one.
                          I got a new compressor w/clutch (forget the brand) from a reputable wholesaler tha I do business with on a regular basis.

                          I also opted for the MotorCraft dryer this time, which hopefully will be the correct size.

                          This will be a good time to pull the leaking radiator have it fixed. I also plan on pressure washing the Condenser well and remove the blower motor and cleaning the evap core.
                          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

                            #14
                            Your problems, and approach to fixing things, are similar to mine.

                            Why do you not want to disassemble and rebuild the compressor? Yes cost may be close however knowing it is done right must hold some value.

                            Do you have any MotorCraft part numbers? I was thinking of replacing hoses, etc., along with pulling everything out, clean, inspect, repair, reassemble.

                            Are there other things to do while area is being worked on, eg. heater/blower/other?

                            Comment

                              #15
                              got the compressor/dryer and orifice tube replaced the other day.

                              new compressor was a new aftermarket and slighty different design. only problems I ran into was having to grind a little bit off to make the support bracket fit and get a half inch shorter belt, because the pulley was slightly smaller.





                              also spent a little bit more ($153) to get a Motorcraft drier. the difference is noticable, as the aftermarket unit I got
                              last time was shorter and fit poorly.




                              car goes to the shop wednesday to get charged, fingers crossed that it cools well this time.
                              Last edited by 88grandmarq; 07-04-2010, 08:35 PM.
                              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

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