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Thread: ac help

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    ac help

    Hey, i recently purchased a 92 sl, which ac wasnt working when i bought. so i evacuated the system an purchased that envirosafe crap. well that stuff sucks the coldest it got was maybe 65,than it leaked out so i put a half can of that artic freeze from walmart in it, an the ac was ice cold for roughly 2-3 weeks, i drove it to the store, working fine. left the store an couldnt get the ac to work, figured the leak got bigger, so i than put leak detector in it an a little more 134a, an it wont work at all now, the gauge that came with the can i bought says its full an i check the system daily to see if its leaked out but hasnt, just blows hot air, the compressor is on(clutch engages). I only know a little about our ac systems i need someone to help me, i live in florida an its blazing here, i also have a black car which doesnt help.

    btw i cant find any of the leak detector anywhere in the car to suggest a leak

    thanks in advance

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    94 3500gt vr2? verified Feedback Score 9 (100%) n2nsanity's Avatar
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    no flashing lights on the ac switch?
    digital or manual climate control?
    if you're sure the clutch is engaging and compressor is working properly, i'd check your blend door
    sucks you have to remove the dash to replace it, but i think you can crawl under and test it with the dash in


    you probably already know this, but 91, 92 compressors are different models and designed for r12 which is a different oil and designed for different pressure
    by adding r134 and not changing out the compressor, the pressure switches in the compressor might not be working properly even tho clutch is engaged

    to do a proper r134 conversion, you should be replacing at least the compressor and accumulator/drier
    you can probably get away with reusing the old lines, condensor and evap core
    but if you're already spending the $ on a new or rebuilt r134 compressor, i'd recommend replacing everything but the lines

    ton of writeups out there for the conversion
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    Thermal Engineer- Mmbr Since:8/2005 verified Feedback Score 0 Alex3000gt's Avatar
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    Any updates on this?

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    it has a leak. just cant find it an leak detector isnt showing it. when i put 134a in it turn the car off an listen you can hear a hissing sound coming from down towards the comrpessor. but cant find the leak.

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    ok i believe i found the leak, i have dye surrounding these two things on my compressor, although i have no i dea what they are for an weather they could be changed. anyone could shed some light as to what these things are circled an if they can be changed or do i need a new compressor id really appreciate it, thank you



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    Thermal Engineer- Mmbr Since:8/2005 verified Feedback Score 0 Alex3000gt's Avatar
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    I am curious too. Bump.

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    ok so i just took my compressor, than i pulled that thing out (the one circled closer to the right compressor) it has like 3 orings on it, i noticed they were all jacked up so i put new orings on it put it back in an fixed my leak, although the system is full an still blowing outside air. fml always something

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    Did you pull a vacuum and it did hold vacuum?

    Most powerful 13T car in the world @501awhp, PTE 780CC injectors, AFPR, E85, Greddy Profec B, 3.5" Granatelli MAF, MAFT, SS Headers and O2 housings front, 3SX downpipe, CRX racing FMIC, Dejon intake pipes, Ground Controls, Maximal adjustable rear control arms, Maximal TC Brace, Poly front and rear mounts, Vacuum Reduction, EGR block off plate, Hot Wired Walbro 255 and inline Walbro 255, Southbend stage 3 clutch, Slotted and vented rotors, SAFCII, Turbo XS BOV, 3SX FP hotwire, Seatle Short Shifter, Jackhammer timing gears: Best 1/4 mile 12.33 at 114.9 mph 1.79 60ft.

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    no because i mainly wanted to see if i fixed the leak. which i did because it hasnt lost any 134a, so im buying this machine from harbor freight today to pull a vacuum, do you have any idea how it works???

    Air Vacuum Pump with R134A and R12 Connectors

    im also waiting on my new drier in the mail.

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    94 3500gt vr2? verified Feedback Score 9 (100%) n2nsanity's Avatar
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    i have one of those, lol. haven't used it yet tho
    you hook up an air compressor to the T or something
    mine seemed to be missing some pieces, so i didn't mess with it
    the dual line guage is probably more useful


    be sure to also check the connections at the condenser

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