Heater blower is back agains the firewall, A/C blower is at bottom of console.

Switch is on console, it's fairly easy to remove the console and see what's in back.

Vacuum element is on driver's side of HVAC box, if I recall correctly.

Jim

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14 E250 BlueTEC black. 45k miles
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94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles