Fixed!
My indy ran some checks and found the a/c system low on refrigerant. He added 1 pound of R134A and both driver and passenger zones now get down to 39-40F.
For those who are thinking of getting a license to DIY, this pound of refrigerant cost me a total of $130.44 including labor (northern California prices, including our new 9.25% sales tax). Depending on your particular circumstances, the cost of the license, equipment, and supplies could easily be justified.
Thanks for your help with the diagnosis.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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