I have the Bouchillon AC on my 340. It only uses one belt for the AC. I believe it even says so in the instructions. Only one belt will line up with the pulleys correctly. I have never had any problems at all. The Sanden compressor is much easier to spin and less strain on the motor than the old iron monster that was originally on the car. One belt does the job fine. Matter of fact, the same compress or is run on one belt in many car applications without issue.