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Old 07-30-2008, 11:49 PM
FineOlBenz's Avatar
Registered User
Join Date: Dec 2001
Location: Sonora California USA
Posts: 389
AC oil? AC 134?

Easy questions I hope. How much PAG oil and how much R134? I'm replacing the compressor and filter drier with a Napa (Made in China model drier) as the Napa warantee was 2 years on the compressor. I had to buy a new drier with a current receipt. My original Mercedes drier (still in the box) was not good enough with a 12 year old receipt. Just *****ing here. Back to the real question How much oil and where, how much 134 and I know where ?

From what I understand it takes less 134 than R 12. Two cans worked good in my 240, I'd just like the 300D to work better.

1984 280SEL, 62,000 miles
Euro model in the USA
1983 300D (Totaled out 10/2004)
New Factory Mint Green paint
Palomino int
1982 240D (Steak dinner for two)
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Old 07-31-2008, 12:13 AM
compress ignite's Avatar
Drone aspiring to Serfdom
Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
How Much

I would ask VSTECH for advice on the quantities.

[Unsolicited: I'll tell you ,without a parallel flow condenser OR retrofitting back
to R-12 you ain't gonna be impressed with the vent temps.)
'84 300SD sold
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Old 07-31-2008, 12:33 AM
compu_85's Avatar
Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
My 1134A equipped SDL blows 43*F air when moving with the resirc off. Plenty cold for me. Now at idle.... not so much, it goes up 58 or so :/

1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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Old 07-31-2008, 09:24 AM
vstech's Avatar
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,386
... if you want the 300D to work better than the 240 that has 134 in it, put 12 back in.
if not 12, NAPA stocks freeze 12, which is a blend of 134 and something else to give close to 12 performance.
did you totally flush the lines, AND the condenser, AND the evaporator? with a/c flush kit? has a great pictorial on this.
I would start there. oh, and a 12 year old filter/drier would be junk anyway... they don't keep long.
you should replace the expansion valve while you have it open as well. it's all explained in the diy on DG's page.
ebay and craigslist are great sources for R$12, I got my last 30LB jug for free!!! (well, I serviced the guy's Home A/C in trade for it. not a bad deal, 1.5 hours "inspecting" his system, and a pound or two of R22 and he was thrilled! and I walked away with a 34Lb jug of 12!

John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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