I have a 1988 560sl and the a/c starts out working fine but fades away until the blower is not working. It may come back on and it may not. Several years ago I had a similar issue and had it repaired. I have since moved and can't get back to the same shop. If memory serves me correctly he replaced some type of vacuum switch under the hood and it wasn't very expensive.Any help is appreciated...thanks

Sounds like you still have a vacuum issue.

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Current Benzes

1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

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Not in this weather!

I'm not sure I see how a vacuum issue could bring the blower motor to a halt.

Is the blower motor actually stopping?

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2012 E350
2006 Callaway SC560

the blower does come to a stop...the a/c unit reacts as if it's reached the appropriate temperature...

I think the blower would keep running even when the desired temperture is reached. It does not shut down completely like the AC in a house.

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2012 E350
2006 Callaway SC560

I imagine it could stop if the low-speed fan circuit had something wrong with it. It may just be adjusting down to low speed which is non-functioning.

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If you put the temp wheel all the way to the blue side (cold) will the A/C continue running?

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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

Sounds like your blower is malfunctioning.could be brushes.i had to replace my blower motor recently on my 87.the commutater ring where the brushes ride was completely worn out.same type symptoms you describe

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michael cole 1980 300SD gone now but not forgotten,87tdt,90 300te 4matic 95 e320 wagon

I'm also thinking the resistance circuit that produces the low speed may be open.

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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