Im doing this off memory but i think its correct. Use a multimeter on pins 1 and 7 of the AMP, you should see about 5 volts when you turn the temp dial. If you see voltage then you know your amp is good and that your CCU is good and the problem is a stuck servo.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000
GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles
http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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