Here is a link to an A/C capacity guide I got from another site
http://www.napabeltshose.com/downloads/download_common.cfm?file=NapaCapacityGuide2-8-05.pdf&folder=news&view=napa_hc
Save a capy to your computer before it's gone.

Awesome - Thanks !!!

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

A very useful guide, indeed for those whose models years are mentioned. But a pity the older models 1986 on down are ignored.

Does anyone know what capacities are specified for 300 SD T/D 1980/85, especially those, such as mine, with an R4 Harrison Model #320 Compressor ?

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1984 300SD TURBO DIESEL

I've noticed as a rough guide that chassis capacities seem to be very similar and in many cases identical across the board. Witness the W126 (like yours) which takes 48 oz. R12 and 7.75 oz. mineral oil for both the 560SEL and 420SEL. I have a 380SE and recall reading somewhere in this forum that the capacity is 48 oz. and I used that figure in calculating my R134a charge over the weekend. It's just nice seeing printed confirmation.

EDIT: I did a typo - the actual capacity is 46 oz. or 2.875 pounds.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

http://www.napabeltshose.com/news/index.cfm?id=1517&show=newsitem&location_id=1078

This is the new link, the first one is dead now.

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Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current

http://search.ebay.com/_W0QQsassZkhazenzcc

what is the correct refrigerant capacityfor R12 in a w126? (R4 compressor)

i have seen;

1) on the red sticker on top of the radiator-3.3lbs
2) FSM cd-1800 grams-2.87 lbs
3) my indy's snap on cd - 3.5 lbs
4) this forum 2.2 lbs

this is a big difference! anyone?

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1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

609 Certification

Option #2 is the correct one (2.87 lbs), see my post above. I think the confusion comes in when cans of refrigerant are sometimes called a "pound" when in fact they only contain 10, 12, or 14 oz. of refrigerant. Also, in your search on this forum, you may run into calculated capacities of R134a, which are around 80% of R12 capacity in a converted system (could be your option #4).

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

thanks for reply.

why does the oe red R12 sticker say 3.3lbs? above it it has W123-2.8 lbs and W107-2.2 lbs?

__________________
1993 Mercedes Benz 300D 2.5 205K (ex wife's)
1984 Mercedes Benz 300SD 320K (SOLD)
2004 Mercedes Benz C240 75K
1995 GMC Sierra 2WD 5.7L 188K
1983 Mercedes Benz 300SD 239K (SOLD)
1987 BMW 325i 220K (SOLD FOR SALVAGE)

609 Certification

I really have no idea. I would just go by the numbers in the guide - they are pretty consistent with what I have seen here.

If you're filling with R12, you can use the sight glass as an effective method of gauging your charge. Just fill up until it's almost clear, with just a few bubbles floating past. You want to avoid a "foamy" appearance in the glass.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280