I took the test today. Piece-o-cake. Finding HCFC-12 may be another issue tho...

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Never a dull moment at Berry Hill Farm.

I saw a case of 12 sell for around $170 a while back, 14oz cans. Only on ebay.

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I'm not a doctor, but I'll have a look.

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

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

I nkow the Autozone by me has it. It was awhile ago that I asked but I think he said it would have to be ordered as well as me having a 609. Maybe I should take the test and start selling this stuff for $20/can, then after I sell 3 I'd have my license paid for.

Regarding the questions on the test, aren't they more about the environment than servicing an A/C system? I heard that a couple questions are pretty tricky.

Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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Just curious if anyone has used propane and Isobutane?..

I have seen it used by others and you can make ice cubes ...

let the flaming begin.. but as you do... tell me how in the world you would get the right combination of air and fuel to ignite a system with proane in it?

PS I do not have it in my sytems.

it won't carry oil and your compressor would burn up before all that long as a result.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

Not so... the only bad things about propane and isobutane is the flamability and the fact that you have to evacuate and recharge completely if there is a leak. I wouldn't recommend it, but it is a good test refigerant.

http://cathey.dogear.com/cwair.html -- guy who uses it in multiple vehicles...

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John Robbins
'05 E320 CDI - 240k
'87 300TD - 318k

With my new 609 certificate, I bought three cans of HCFC-12 today at a locally-owned parts chain called A-Line (sells mostly to repair shops). $140!!!

However, I now have really cold a/c both in my 300D and 240D.

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Never a dull moment at Berry Hill Farm.

Any of you a/c guys heard of a product called "cryo-seal"?

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

It is banned by the EPA as an automotive refrigerant.

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MB-less

I know... but did you know..
The average female might have almost that much propane in the
propellants of the various products she has in her bathroom.

Due to smaller post-atomic particle size of R134 versus R12 ,heat transfer
coefficient is less.[R134 wiil carry away less of the passenger compartment
heat as compared to R12]

To maintain the same efficiency,a Parallel Flow Condensor [30% more
efficient than O.E.M.] is necessary.

Even with a P.F.C. a conversion will never equal the vent temperatures
possible with R12 in a O.E. R12 system.

R12...30 Degrees "F" at the vents [without a frozen evaporator]
R134... Maybe 45 Degrees "F" at the vents.

Thank you for explaining all that in such simple terms. In my current search for R12 many techs have tried to convince me to convert to R134a. I tell them that the high pressures of the system will probably send my compressor to the graveyard after two summers of intense use. Also, my system, having been designed for R12, may suffer consequences in parts that I don't even know of.

I tried to charge with R12 today but it didn't even go into the system. Just a little bit did, enough to allow the compressor to engage. Something is blocked in the system thereby preventing the refridgerant from flowing around it. I'll get the system flushed and then try again. It held vacuum steadily for 20 minutes so I know I have no leakages. I ended up using the R12 can (which I had already opened) to top off the system in my Honda Civic.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver

anyone tryed propane/butane mix instead of R12? It works, it’s cheap, Australians use it.

Tom

I went to Autozone and they say they haven't sold R-12 in years. Guess it's a regional thing.

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-Dave

My guess is that at Autozonie most of the counter personnel are more familiar with lighted mudflaps, NOS stickers and spinning hubcaps than anything involved with the comprehensive repair or maintenance of a 20+ year old European vehicle.

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Never a dull moment at Berry Hill Farm.