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#1
05-22-2008, 03:37 PM
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Should my A/C inlet port be bubbling at all?
I found this spring that my A/C (R12) was not blowing cold air at all and assumed that it needed a charge. When I unscrewed the cap and inspected the inlet valve at the front of the engine (W123 84 300D Turbo) I saw some moisture and a few tiny bubbles. So I assumed that I had a small leak in that valve.
I went to have it serviced, as I am not set up with any A/C equipment, and pointed out to the mechanic that I noticed the valve may have a leak. He recharged it, it is blowing ice cold now, but upon later inspection, when I unscrewed the cap, I heard a brief hiss from some built up pressure and saw moisture and small bubbles. I went back to the mechanic and he tightened the valve a little bit, and said I should leave the cap on tight as this keeps it from leaking. I am skeptical. I thought the cap was to keep the port clean, not to act as a seal. Can someone confirm this for me?
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85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale** 84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds 00 Toyota Sienna 208K (Sold) 15 Subaru Outback 43K 11 Subaru Outback 67K 98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now. 30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60 
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#2
05-22-2008, 03:43 PM
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there should be a NEW schrader valve under the cap if it was serviced by a competent mechanic.
I have the tools to do it under pressure, he should too...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
05-22-2008, 06:20 PM
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Yes the cap is part of the sealing as the mechanic said. Unlike a tire valve stem, most A/C caps have small o rings or a tapered thread to help seal. I agree with VSTECH. Should have had a new valve as well.
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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.
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