My 2003 C240 4-matic wagon has an "AC off" button that is different from the one described in the owners manual. In the manual, the button is labeled "AC off REST" and has two LEDs, one for "AC off" and another for "REST". The corresponding button on my climate control has only one LED and is labelled "AC off". Here's the strange part: when I press the button after turning off the car, the residual heating system activates. However, there is no LED, or REST label on the button. What's up with that?

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Colin
'98 E300DT
'06 C55