Are all of your vacuum pods actuating correctly? Check the recycle door. Verify the monovalve is closing too when on Max AC. Fan clutch actually work? Few do with age... a hint? Sachs ones are the only that work in my experience, spend the extra money for them. Also use the later fan for the M103.

Clean the condenser, the dual fan ones are a prick to do. Just do it. The evap needs a cleaning at this point too. 'Evap Powr-C' works boss for this procedure, just pick up a hand actuated container and wand to apply. It will take work, but worth the trouble.

If you have a leaky system, save the R12 for now. You probably have original orings and a leaking compressor. BTDT. Reseal the entire thing while it is cool out and flush it. Seriously. Use a syn compressor oil. Mastercool for the vac pump and Yellow Jacket or MC for the gauges.

A quick, cheap charge is with 152A if you just need to get by...did this in the 300E for years before it met its demise. Multiply your charge weight, 2.9lbs on the W126 by 0.54 and that is your 152A charge. Yes, it is air duster. It works as well as R12 pressure wise and cooling wise. You need two full, 10oz cans and one half of another. The last you have to meter in via pressure. I use R12 charts. Now if you can find 12oz cans, you are perfect. Two of them is pretty much full. Three, 10oz cans at my local Walmart are $12.

BTW, the car will never cool with faulty recycle and defrost pods. Tint will help cool the W126 vastly also. Even a mild 50% quality film.

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'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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