My car wouldnt turn off and if I locked the doors it would turn off. I replaced the passengers side vacuum element. You can check with your service CD for the positions of the lines. Try under the passengers side floor mat, if you put vacuum to it, you should hear it somewhere, like the fuel door will make a noise, etc.

AC is usually $1000 to fix.

Transmission rebuild is around $1500, good guess.

Austin

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.