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Old 05-17-2003, 01:39 PM
Thomaspin's Avatar
Join Date: Jun 2001
Location: CA
Posts: 531
A/C problem? Consult The Bible.

This is a message of sincere thanks to Larry Bible for walking me through the necessary repairs to the a/c system on my 300SD.

From a non-functioning, blocked system to one which cools nicely was a matter of several weeks' correspondence and much time spent by Larry Bible in helping me fix multiple problems.

Well, this thing fought me to the bitter end.

After replacing a blocked expansion valve (boy, is it tough to get at that top left hand nut, or what?), the receiver-drier, the gauge connectors, putting dye in the system, I got the thing working only to have the condenser blow.

Before vacuuming the system out thoroughly I thought I would verify the pressures on my 560SEL (also R134a) as a cross check - 19 low, 135 high, which equates with 2.2 x Ambient temp in F (I did this at 60F - cool morning). As I detached the low side, the blasted valve got stuck open and I lost the R134a from the now I have another system to fix, albeit at little labor expenditure.

I vacuumed the 300SD out thoroughly and recharged to the same 19 low, 135 high. The weight of R134a in the system was 1 lb 8 ozs, which is correct for the R4 compressor, so weight and pressures correlated nicely. Larry has advised that weight is the way to go, but it's nice to have a cross check.

So, one receiver-drier, one expansion valve, one blasted temp switch as the original would not fit the new r/d and one condenser later, I have a functioning a/c system on the 300SD.

Larry - this would not have been possible without your help and selfless assistance and I am deeply grateful. In the process, I learned about how things go together on a car a/c system (I am reasonably comfortable with the physiscs of a/c and related concepts) but now I know how to fix it in a car. Sure hope I never have to replace an evaporator, though!

Bottom line - if you have a/c problems, consult The Bible.
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Old 05-17-2003, 02:45 PM
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
Thumbs up

Yep, Larry's the man.

He has selflessly helped people out on all kinds of problems including a/c and engines, gas and diesel.
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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Old 05-18-2003, 12:02 AM
Registered User
Join Date: Sep 2000
Location: Shalimar, FL
Posts: 79

Are you sure you are only using 1lb 8oz, my 300SD uses 1.5Kg of R-12, with R-134 at approximately 80% that should be around 40-42oz, you are using almost half that.

Bob H.
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