1999 BMW 328

Transmission problem
1999 BMW 328 6 cyl Two Wheel Drive Automatic

The problem started with the airconditioner not cooling when the car is moving but cools when idle and during the repairs a warning sign came out on the transmission sign and the gear shift changed it takes too long to change and makes a sound it the rear when you step on the brake and the gears change. The mechanics say the problem is from the brain box and its not showing transmission when viewed on the diagonistics system. Do I need to change the brain box?
July 1, 2009.

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