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My '85 MGM, "Maisa"

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    86 - 85 All Eng. - 10.00 Oz. Mineral Oil; 52.00 Oz. R-12 (According to Four Seasons Site). They will use PAG with a R-134a conversion. The refrigerant capacity will be different but not certain on the oil. Probably be the same but they may play with the combinations.
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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      Originally posted by friskyfrankie View Post
      86 - 85 All Eng. - 10.00 Oz. Mineral Oil; 52.00 Oz. R-12 (According to Four Seasons Site). They will use PAG with a R-134a conversion. The refrigerant capacity will be different but not certain on the oil. Probably be the same but they may play with the combinations.
      Thanks, I'll have to verify with the shop anyways. Compressor is prefilled with PAG 46.
      The sticker in my car says 1,6kg of R12, which would be 56 Oz.

      As long as there's enough oil in it, it'll be fine to fiddle with. Obviously we can now see what happens with not enough oil
      1985 Mercury Grand Marquis LS, "Maisa"
      2005 Volvo V70 Bi-Fuel

      Comment


        Assuming you are converting to R134a, here is a decent primer of information:

        R134a vs R12 refrigerant in the Porsche. R134a is a approved alternative refrigerant to replace R12 refrigerant in the Porsche.
        What I Own: 1993 Mercury Grand Marquis GS
        What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

        Comment


          Originally posted by friskyfrankie View Post
          Assuming you are converting to R134a, here is a decent primer of information:

          https://griffiths.com/ac-system-help.../r134a-vs-r12/
          Quote from the notes at the bottom of the linked article.
          We mention using “ester” type refrigerant oil. Some compressor manufacturer’s or OEM’s suggest PAG type oil for R134a. But some types of PAG do not mix well with the old residual R12 mineral oil left in the system components whereas “ester” does mix very well.
          This. If you don't clean out the system during a conversion, you can create acids that will eat up various things if the PAG oil and residues in the system get angry with each other.

          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


            ALL VERY true! This is why where the car is taken to is so important.
            What I Own: 1993 Mercury Grand Marquis GS
            What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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              If the compressor and drier are new, and the system is getting flushed there won't be any old oil to deal with. PAG should be just fine on a clean system.
              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


                Originally posted by Arquemann View Post
                The new compressor says it's prefilled with 3oz of pag oil. Is that the full capacity for the whole system?
                Don't believe the manufacturer that the proper amount of oil was added. I would drain as much as possible then refill.

                Comment


                  Originally posted by gadget73 View Post
                  If the compressor and drier are new, and the system is getting flushed there won't be any old oil to deal with. PAG should be just fine on a clean system.
                  Agreed. As long as the system is completely flushed. Some techs have a problem doing just that.
                  What I Own: 1993 Mercury Grand Marquis GS
                  What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

                  Comment


                    Another thing to do is rotate the compressor by hand a dozen times after being installed before cranking up and engaging the clutch. This can help prevent shipping oil that's stuck in the pistons from blowing out seals. I started doing that after the 3rd replacement and saw that on a power steering pump install sheet (though that's to get lubrication into the pump in that case... instead of getting excess lubrication out of it). Haven't had any die within 6 months so far. Still had the odd one die after 2 years though.

                    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


                      the NOS one I just put on tonight was damn near stuck initially. Had been parked since late 1983 with oil in it, and it needed some oomph to get moving again. Freed up fine, and I dumped all the old oil out. Mineral oil, and it was so old it looked more like motor oil than the clear-amber color fresh refrigeration oil is. Not using R12 on that one, so the mineral oil is not helpful. I got as much out as possible and put ester in.
                      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


                        Parts came today, 48 hours from Arizona to finnish customs, another 48 hours from the customs to me. The customs warehouse is under 45 minutes from me
                        Gotta mock up the compressor, clutch connector might also be different.

                        The RA listing said the compressor was prefilled with 3oz, now the compressor box says prefilled with 5.4oz which is supposedly total capacity, 4seasons says total capacity is 10oz.
                        And the compressor box also says to empty it out and measure anyways

                        I'll discuss with the shop guys either way.
                        1985 Mercury Grand Marquis LS, "Maisa"
                        2005 Volvo V70 Bi-Fuel

                        Comment


                          Yeah they probably would want to empty the oil so they are starting from scratch. Makes the measuring a little easier or they could empty it and measure but either way a full empty is required.
                          What I Own: 1993 Mercury Grand Marquis GS
                          What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

                          Comment


                            The 1984 shop manual says new Motorshaft compressors ship with 10 ounces, which is total system capacity. they say when using it as a replacement compressor, dump 4 ounces of oil out. I have enough fingers to say that ought to leave 6 ounces, so the 5.4 ounces in a replacement compressor is probably a valid number for just a replacement compressor. Its not total system capacity. If you're flushing it all out, it needs another 4.6 ounces dumped in to get it up to full charge.
                            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


                              Took the car to the shop friday evening, they called on monday before closing time that it'll probably be done tuesday afternoon, today they called and said it'll be done tomorrow.
                              They said that the condenser was quite clean, but the evaporator was almost clogged from the glitter and crap... A handful of metal grit and chunks. They've flushed and soaked the evaporator for two days, now it's supposedly totally clean, and they'll get to assembling, filling and testing the system tomorrow.
                              Guy on the phone mentioned that on initial inspection they'd have recommended to get a new evaporator core, but they were unsure on availability and if any of their guys would want to go pull everything apart for replacement, (on my approval of course) unless absolutely necessary.

                              Well, this whole thing will end up being a "bit" more expensive than initially though, but I guess it'll be done properly atleast.
                              Atleast I'll have cold AC when the ol' 302 kicks the bucket sooner or later.
                              1985 Mercury Grand Marquis LS, "Maisa"
                              2005 Volvo V70 Bi-Fuel

                              Comment


                                No swamp ass is a good thing and worth it. I find myself running the A/C even just to get rid of the humidity.
                                1985 LTD Crown Victoria - SOLD
                                1988 Town Car Signature - Current Party Barge

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