I had worn links and the car would do a rear end wiggle when shifting gears under power.

The blower regulator is under the blower, which is under the wiper, which is under the black plastic cover below and in front of the windshield.

Check the wiring diagram, there is a plug for the regulator just inside the brake booster, you can jump to the high blower mode at this plug.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles