The evaporator temperature sensor can fail, causing the AC compressor not to cycle. If the AC compressor does not turn on, the AC system will not blow cold air. If the compressor is stuck on, the air will be very cold at first, before warming up.Google+
Car Problem Reports
Mercedes-Benz CLK320 Evaporator Temperature Sensor Failure
Mercedes-Benz CLK320 Problem
Average Mileage: 122,500 mi (105,000 mi - 140,000 mi)
Visitor, 2001 Mercedes-Benz CLK320, 140,000 mi
ac runs well for a few minutes then comp. turns off, turn engine off for a few(10)seconds and comp gomes on and turns off again , aux recirculation pump is bad could that be the cause ?