I used to own a '01 SLK320, and I greatly miss the REST mode that kept the cabin warm for 30 min. Is it possible to do a retrofit in a '99 ML430 that has the old style temperature controls?

I know in order for the blower to come on, the ignition lead has to be hot. Have any ideas?

Not really, computer program in the controller isn't available.

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Does the same hold true for a 2000 ML320?

George