Servicing A/C Freon of '93 Deville
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Servicing A/C Freon of '93 Deville in Past Cadillac Vehicle Discussion; Being this uses the older A/C freon which I cannot find anywhere A/C needs to be serviced since turning A/C ...
  1. #1
    Team ZR-1 is offline Cadillac Owners Member
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    Question Servicing A/C Freon of '93 Deville

    Being this uses the older A/C freon which I cannot find anywhere
    A/C needs to be serviced since turning A/C on trips a service A/C light on DIC and only hot air blows in.
    Does any place on internet still sell older freon or has that gone illegal to use for older cars ?

    What must be done to be able to use the newer freon, high costs ?
    simple drain and fill with new freon ?
    replace few O rings or does it require total removal of compressor and drain freon out of it ?

    Thanks

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  3. #2
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: Servicing A/C Freon of '93 Deville

    r12 is VERY rare - and VERY expensive
    and requires a license to buy it -

    What must be done to be able to use the newer freon,
    here ya go -
    http://lmgtfy.com/?q=r12+to+r134a+conversion+kit

  4. #3
    dennis93coupe's Avatar
    dennis93coupe is offline Cadillac Owners Connoisseur
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    Re: Servicing A/C Freon of '93 Deville

    I converted mine about 3 years ago. I did mine myself, but I have the tools and equipment, good set of gauges, vacuum pump, scale (I measure by weight). I also did a complete reseal on all connections. I did a flush to every line, removed compressor to flush, flushed evap and condensor, replaced drier, replaced orifice, changed charging valves with adapters for r134a and removed valve core from high pressure side. I filled components and lines with oil, not all in one place. pulled a vacuum for 3 hours. Made sure it held for a couple hours and let her charge. It is still blowing cold at 40 degrees from the vents. If you don't have tools and equipment and the know how, you will be better off taking it to somebody you can trust that can do it. It's not too expensive unless you have to start replacing components.

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Servicing A/C Freon of '93 Deville

    Quote Originally Posted by Team ZR-1 View Post
    What must be done to be able to use the newer freon, high costs ?
    simple drain and fill with new freon ?
    It's a lot more involved than just recharging it with R134a.
    http://autoacrepairs.com/134aConversion.htm

  6. #5
    Team ZR-1 is offline Cadillac Owners Member
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    Re: Servicing A/C Freon of '93 Deville

    Thanks for the feedback from all of you

    I took care of this today
    Found local a convert kit called EZchill, about $45

    Comes with 36 ounces of freon that has a mix of leak sealer, red dye, R134, hose that has a low pressure gauge, and inlet filler fitting on to low level side.

    '93 requires 2.87 pounds of R12, for R134 deduct 15% so total full needs about 39 ounces.
    Not great GM thinking but both low/high valves have black caps and do not say which is high/low
    so I tracked it down and GM uses a larger freon tube for low pressure side

    Of course to do a convert would require a total drain of R12 and was surprised when I checked freon pressure at low side to find ZERO pressure !
    Who ever was the last owner for whatever reason had some work done and had to drain A/C system and when work was done forget to recharge A/C.

    With engine at idle and A/C on full blast put 12 ounces in and then clutch of compressor started to ramp on/off.
    Shut engine down and let it sit for 1 hour and then checked to see that pressure was the same so no leaks.

    Added another 12 ounces and clutch would stay on . Waited 30 minutes and then

    Added more R134 till pressure was reporting around 35 PSI and using thermal gun temps in HVAC duct openings went down to about 45 degrees.

    Will check tomorrow and assure no leak and maybe add bit more freon but this EZchill product claims the mix in freon does not require any issues with older O rings, etc

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Servicing A/C Freon of '93 Deville

    Quote Originally Posted by Team ZR-1 View Post
    Comes with 36 ounces of freon that has a mix of leak sealer, red dye, R134, hose that has a low pressure gauge, and inlet filler fitting on to low level side.


    Not great GM thinking but both low/high valves have black caps and do not say which is high/low
    They are made idiot proof (no insult intended) by using different sizes. That's not GM. That's an industry standard.

    Did you also drain the mineral oil out of each component and flush the system and then replace it with PAG150? Mineral oil is NOT compatible with R134a.

  8. #7
    dennis93coupe's Avatar
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    Re: Servicing A/C Freon of '93 Deville

    Like Ranger said, you need to drain and flush all of the old oil from each component. They make a special flush to remove traces of the old oil, that would have needed to be done. Did you pull a vacuum to be sure you don't have a leak?

  9. #8
    calvin ar is offline Cadillac Owners Fanatic
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    Re: Servicing A/C Freon of '93 Deville

    you still can get r-12 on ebay but it is not cheep re did mine last summer

  10. #9
    dave's2002 is offline Cadillac Owners Member
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    Re: Servicing A/C Freon of '93 Deville

    I converted my r134a to r12a it is cheaper and thicker (will not leak) and colder.....and doesn't eat the metal in the system like r134a does.....

  11. #10
    basscatt's Avatar
    basscatt is online now Cadillac Owners Master
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    Re: Servicing A/C Freon of '93 Deville

    Quote Originally Posted by dave's2002 View Post
    I converted my r134a to r12a it is cheaper and thicker (will not leak) and colder.....and doesn't eat the metal in the system like r134a does.....
    --------------------------------
    WOW - convert a 134a system to R12 -

    I will admit that I NEVER heard of anyone doing that -
    and that thought would never have crossed my mind -

    R12 cheaper than 134a - REALLY? - where?

  12. #11
    MoistCabbage's Avatar
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    Quote Originally Posted by dave's2002
    I converted my r134a to r12a it is cheaper
    ???

    thicker (will not leak)
    No, and thicker DOES NOT mean leak proof.

    and doesn't eat the metal in the system like r134a does.....
    R134-A DOES NOT "eat metal".

  13. #12
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Servicing A/C Freon of '93 Deville

    Eat's metal? Cheaper?

    Thicker? It's a gas.

    Talk about some misinformation.
    basscatt and basscatt like this.

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