The time delays are controlled by the multi-function relay located under the hood just aft of the fuse panel (LH side of the car) for my 95 E320. The relay is a closed unit.

Also controls delays associated with rear window defroster, fresh air bi-pass at least.

Good luck and let me know if you make any progress when you crack open that relay.

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Tom Latos
2002 E320
1995 E320 Sold at 288kmiles