R12a vs R134a - Mercedes-Benz Forum
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post #1 of 12 (permalink) Old 07-23-2018, 06:06 AM Thread Starter
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R12a vs R134a

I recently replaced my AC compressor and expansion valve on my 2002 E320. I flushed the system (lots of fluid came out) and then filled it with R134a. It is cooling but not cold.
So; if I replace the R134a with R12a will it be colder?
Any change in capacity or recommended pressures?
Thanks,
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post #2 of 12 (permalink) Old 07-23-2018, 07:42 AM
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Try R290

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post #3 of 12 (permalink) Old 07-23-2018, 07:46 AM
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Can you buy R12 without a licence?
The media are not mixable and even conversion is technically possible (I converted W123 to R134) don't think you will benefit.
Even my commercial freezer runs on R134.
Do proper system troubleshooting per link in stickies.


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post #4 of 12 (permalink) Old 07-23-2018, 07:51 AM
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Originally Posted by Timsawdey View Post
I recently replaced my AC compressor and expansion valve on my 2002 E320. I flushed the system (lots of fluid came out) and then filled it with R134a. It is cooling but not cold.
So; if I replace the R134a with R12a will it be colder?
Any change in capacity or recommended pressures?
Thanks,
What kind of fluid came out? Did your old compressor grenaded.

Did you recharge by weight? Did you replace the dryer/receiver?

Last edited by 260e crusier; 07-23-2018 at 08:01 AM.
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post #5 of 12 (permalink) Old 07-23-2018, 07:56 AM
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Can you buy R12 without a licence?
Yepp. I bought three cans for a guy with a C4 Corvette last week.
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post #6 of 12 (permalink) Old 07-23-2018, 11:46 AM Thread Starter
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The fluid looked like a cleaner solution
It was not the oil in the compressor.
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post #7 of 12 (permalink) Old 07-23-2018, 11:57 AM
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???

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post #8 of 12 (permalink) Old 07-23-2018, 12:00 PM
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Yepp. I bought three cans for a guy with a C4 Corvette last week.
Must cost you a fortune?
But 3 cans is marginal for initial charge. What when you will need more?
Still even R12 suppose to have better cooling capacities, you will inject it in system not design for it.
R134 did freeze our windshield in Texas climate when W124 had small malfunction, so not that is bad refridgerant.


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post #9 of 12 (permalink) Old 07-23-2018, 01:15 PM
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The pressures are different .....

If you have a compressor failure -- you do need to flush the system .. but it's not always successful. The R/D needs to be replaced .. and often the condenser.

Did the new compressor come with oil installed?

Proper pump down and refrigerant fill is required.


I recently had my condenser and R/D replaced (damage) by my independent --- it's working better than ever -- MB fixed it twice previously ...since I bought it in 2010.
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post #10 of 12 (permalink) Old 07-23-2018, 01:55 PM
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Must cost you a fortune?
But 3 cans is marginal for initial charge. What when you will need more?
$100. Real R12. Still be made in other countries.
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