Complete A/C Conversion | Ford Escort Owners Association (FEOA)
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Complete A/C Conversion

Discussion in 'Tech & Repair' started by Blueescortproject, Sep 21, 2018.

  1. Blueescortproject

    Blueescortproject FEOA Member

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    This might be a stupid idea but, in a nutshell, take all R123a components from a 94, 95, or 96 and install them in my 91. Possible or no?

    The A/C in my 91 hasn't worked in years and leaks like a sieve. I thought instead of replacing most everything with 91 parts that I would do it with the R134 parts instead. Labor wise it would be about the same for me but now I would have an up to date system.

    My worry is the ECU and whatever else senses pressure and such in the system would not be compatible with the new hardware. Have any of you done a complete conversion rather than a freon changeover?


    FEOA search pulled up plenty of freon retrofitting but nothing about the full system exchange.
  2. denisond3

    denisond3 Moderator Staff Member

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    You might want to check that the fittings on the evatorator will connect to the hoses and accumulator from the newer system. I dimly recall that the a.c. compressor mounting bolts may be different, but that likely no big deal.

    In the event I ever reconstitute the currently non-working a.c. in my 91, 92 and 93 Escorts, I think I would just buy new components, and have it charged up with R134a and a compatible lubricsant.
  3. Blueescortproject

    Blueescortproject FEOA Member

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    I was planning on replacing /all/ components just to be sure. My dash is cracked and I have a non-cracked one to replace it with. I figured do all this at once: dash, evaporator, heater core, the works.

    You are correct, the R134a lines bolt to the compressor differently, but I was going to pull lines as well from the junkyard and install with a new seal kit.

    I guess I could always throw a can of dye into the system as is to see just how many places it's actually leaking from and determine from there whether the system is salvageable for a retro-fill.
  4. denisond3

    denisond3 Moderator Staff Member

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    The old hoses are one of the parts I would replace with new - as I think the ends of the hoses where they go into the metal ferrule as common sources of leaks.
    zzyzzx likes this.
  5. marclar

    marclar Moderator Staff Member

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    think a better idea would be to 'retrofit' the 134a system and charge it with r12. ive done it before. problem is, you need to get the 'pag' oil out and install mineral oil. the r12 wont 'carry' the pag oil. if you are going to replace compressor, acuumulator, and condensor you could just install mineral oil.
    zzyzzx likes this.

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