The economy button turns the compressor off.

Recirculate turns itself off after a while because Mercedes does not want you to be breathing the same air for over 30 mins without getting any fresh outside air.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record