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-   -   Switch 81 300D from R-12 to 134A? (http://www.peachparts.com/shopforum/tech-help/6414-switch-81-300d-r-12-134a.html)

wilton 02-21-2000 06:33 PM

'Soon be installing new AC compressor & receiver/dryer on recently purchased 81 300D (124 kmi). Should I convert it to 134A? TIA

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Wilton Strickland
Goldsboro, NC
91 350 SDL. 81 300D

SunDance 02-21-2000 07:20 PM

No. The 134 is a less efficient refrigerant, I believe by about 10-15% less cooling. The initial cost of R12 is higher but if your system is leak tight you do not have to worry about refilling costs down the road.

Reza

TommyMB 02-21-2000 07:59 PM

Agreed. I switched to R134 and it doesn't work as well. I wouldn't do it again.

Ed Richardson 02-21-2000 08:57 PM

I switched a 77 300D and it worked fine. The only difference was the costs.

Benzmac 02-21-2000 10:51 PM

I have seen this go both ways. If the r-12 is available to you, it will be fine. The only thing that I have seen is the 134-a will dry out the oil on some occasions and the compressor will sieze up after only a shor time. I see more and more people recommend the 2 year drain and re-fill of the system of new 134 and oil.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM



Aaron 02-21-2000 11:17 PM


I do not recommend switching to 134a. I did it on my 300SD a couple of years back and hated the performance. This coming summer, I am putting a new compressor on and switching back to R-12. More expensive freon= better cooling, less expensive freon=insufficient cooling--especially in a Mercedes.


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Rgds,
Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'79 6.9 (SOLD) :(
'80 300SD
'85 380SE
'89 420SEL
'93 300E 2.8


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