I'm having a hard time visualizing anything involved in standard windshield replacement having an effect on heater operation, electrical or vacuum. This is of course assuming that the windshield person kept his fingers where they belonged.

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Hanno
'79 6.9 Sold (after 27 years)
'83 280SL, 5 spd.
'94 E320 Sdn. 5 spd conversion
'02 E320 Sdn.(on loan to mom!)
'87 300E (5 spd. conversion) Sold
'05 E500 Wagon