Buick Rendezvous Problem Reports

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My local dealer service has been trying to fix this problem for over six months: AC/H does on and off. Either it will not turn on when I start the car and then (sometimes) it will come on when I hit a bump. Or, it will come on when I start the engine, and turn off when I hit a bump.

I am only a university literature professor, but that seems like an electrical wiring short or loose connection to me. So far, the electric techs have changed fus...