air conditioner - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 06-03-2011, 04:25 PM Thread Starter
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Vehicle: 1984 380 SL
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air conditioner

1984 380 sl - a/c not blowing cold - does this car use the R-34 to add freon
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post #2 of 5 (permalink) Old 06-04-2011, 10:28 AM
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Unless it has been converted, your car uses r-12 freon.
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post #3 of 5 (permalink) Old 06-04-2011, 02:12 PM Thread Starter
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Is there an easy way to tell if it has been converted - short of tasking it to a mechanic -
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post #4 of 5 (permalink) Old 06-06-2011, 12:21 PM
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There should be sticker under hood if it was converted. If your AC dosen't work there could be multiple causes but at a miimum you will need the system flushed, dryer replaced, probably compressor replaced and system pressurized with dry gas to check for leaks. Then you can evaluate where you are and repair as needed. So if the system was converted it's kind of irrelivant at this point. if you just put more freon in it it will fail again shortly if it works at all.

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post #5 of 5 (permalink) Old 06-06-2011, 03:22 PM
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The R134a conversions usually have a light blue cap on the valve where refrigerant is added. The R134a valve is larger than the R12. The R134a valve (male) does not have threads on the outside -- it uses a lock ring on the female side to hold the accessory hose (that the refrigerant can is hooked to). The R12 valve (male) has treads on the outside. Do a search on Google for A/C recharging and photos will display what I'm talking about. You could also ask someone at PepBoys or Autozone to step outside and look for you. If you need can find them for sale on Craigslist typically. Good luck!
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