I pressed the CCU to get the AC working and nothing happens. I pressed all of the buttons and there is no response. I went ahead and checked the 30 AMP fuse and it looked fine. Had a spare and still nothing happens. When I was driving warm air was being blown inside the car without the blower. Bad Blower or the CCU unit? Any ideas? How to properly test..... Thanks!

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200 75 W115 (Mom's)
190e 90 2.6 W201
E320 95 Wagon W124
72 BMW 3.0 CSI