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#1
06-03-2008, 02:43 PM
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What Type Freon?
Phil Here, Well It's getting Hot down here in Fla. Time to hoist the Hard Top on the Sweet 500sl and crank up the A/C! My 1992 runs Cool to Cold air, I'm thinking to recharge the unit? Would anybody know what type of Freon should I use to top off my unit? My Mech. say's that I have a slight leak, but he would say that If i brought him in a New SLR.
I don't know If I can mix Freons, so help me with a suggestion? 1992 Sweet 500SL Phil Justice 
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#2
06-03-2008, 03:33 PM
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Your mechanic should be able to answer that question.
Your car is probably r-12, but it could have been converted to r-134. The mechanic should be able to tell by looking at the re-charge low pressure fitting. No, you can't mix. Some people will substitute "freeze 12" for r-12, but that will start another entire debate
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1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k  1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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#3
06-03-2008, 05:06 PM
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Threaded fitting = R12
Quick disconnect = R134a Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#4
06-03-2008, 06:33 PM
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Outside threaded fitting=R12
Inside threaded fitting (you have to unscrew the cap)=R134 The outside of the R134 fitting allows a quick disconnect hookup.
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#5
06-03-2008, 07:05 PM
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Phil,
The US delivered 1992 500 SLs, like ours were manufactured with R-134. I believe that there were some manufactured with R-12 for european delivery. There is a sticker on the radiator support that confirms this and specifies the capacities. You can unscrew the cap on a fitting and see that the outside of the fitting is designed for a clip-on hose fitting. The older R-12 fittings are threaded. As far as I know, one brand of R-134 is as good as another. I have mixed brands many times.
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02 S500 92 500SL 92 400E (Sold) 87 300E (Sold) 83 300D Turbo (Sold) 75 300D (Sold) 74 240D (Sold after 20 years)
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#6
06-03-2008, 08:00 PM
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Phil Here. Thanks guys, Just as you said SPEACE, R-134 A listed on the Radiator Cross-member and the fittings check out to the same.
Speace, How about posting some pictures of your Sweet 500SL 1992 Sweet 500SL Phil Justice
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#7
06-03-2008, 08:18 PM
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I don't really have many picures.
Besides, it looks just like yours, no?  I added a link in my signature below to a pic for you! My wheels are from a 2003 SL500.
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02 S500 92 500SL 92 400E (Sold) 87 300E (Sold) 83 300D Turbo (Sold) 75 300D (Sold) 74 240D (Sold after 20 years)
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