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The control unit involved is the AAM (all-activity module).
I believe I have heard of this malfunctioning in this manner before.
The early ML's have no REST functon, it got this function in model year 2002 when the climate control was revised. In all MB's I am aware of, the REST function will operate until the voltage has been drawn down to 11 volts, or if the system is unable to provide cooling or heating as required to maintain the set temp, in other words the heater core has cooled off or the evaporator has warmed up too much.
Gilly
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