Thank you for the replies...makes sense. Ill give it a test and if by some miracle my system has something in it Ill take it in.

What doesn't make sense is that they use 134a for computer dusters and who knows what else.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car

I don't believe that they use 134 in dusters, it's a flammable gas, probably a propane derivative... which is mostly carbon, which is also a greenhouse gas, so not sure still why they don't regulate it, but who knows really why stuff gets outlawed...

r12 was outlawed because the patent rights ran out, look for 134 to do the same in about 10 years........ at least thats what my conspiracy theory freinds tell me.

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)

I'm considering Envirosafe to use instead of r-134a in my 300cd because r-134a doesn't quite cut in in hot and humid Saint Louis weather. It's a mix of propane/butane/etc, right? I would be worried about it leaking out and causing a fire or having the engine run away on the propane, has that ever happened, or is it pretty much "safe" to use?

I assume all that would need to be done is to have the r-134a in my A/C system removed and the Envirosafe put in... What about the oil in the compressor system though, should that be changed as well? My A/C system was overhauled with a new compressor, etc in 2000 and converted to r-134a.()

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1980 240d
1999 SL500

HFC-134a is whats used in dusters. Thats why they get so cold during use.