Quote:
Originally Posted by 1981_300sd
Just out of curiosity, what is wrong with the stop leak stuff? I went to two automotive stores and could not find any pure refrigerant.
It was all refrigerant + leak sealer + oil.
And I beg you, don't flame me for the question! haha.
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No, You are quite right....Auto-Stores ONLY supply the 'Ready-Mixed' stuff....
Last year, I had to sort the AC out on that hideous BMW. The Condenser was faulty, so that was replaced, and the 'receiver/dryer' thing. I stripped and cleaned out the compressor, which I filled with the correct PAG100 oil. and used an old 'Fridge' compressor as a Vac-Pump, pumped it down to near full-vac, after confirming all hoses/unions were leak-free and then filled it with R134a I got from a refrigeration supply-house, I filled the system enough to eliminate the vac, then re-vac'ed that out to sort of 'flush' the last remaining air. I then charged it with the correct weight of gas
The BMW contains 1.5Kg of gas approximately if memory serves correctly, easily measured by the weight of the gas-bottles. I was able to buy the gas in disposable 1Kg bottles, which made things nice and easy. I used the fittings from the 'Auto-Shop' re-charge can to fill the system
The two bottles of R134A cost around the same as the 500g container of stuff I first bought in a auto-store, when I first investigated why the AC didnt work.....
It seems the Only place you'll get just the gas, and just the oil separate is at a specialist refrigeration/A.C. supply-house.....
If you need to fill with gas, you'll need to fill with oil too....Too much oil will make the system inefficient, Too little will cause compressor failure/seizure, so its important to guage the quantity in the system There Should be a chart somewhere for the M.B, saying the 'expected' quantity of oil in each major component if the system has been discharged properly for other work.
PAG oil, is rather like Brake-Fluid, Meaning it will absorb water from the air. IF the system was Completely down to air, or has been 'open' for some time, then it really will need 'flushing' through with a solvent before re-charging with the correct amount of oil and gas....
Check Exactly what sort of oil Your Compressor uses before getting it. Its NOT that cheap!--Most systems using 134A seem to use PAG of one type or another
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Alastair AKA H.C.II South Wales, U.K. based member
W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.
W114, 1975 280E Custard Yellow,
-Great above decks
needs chassis welding--Really will do it this year....
