Keith, When you replace the mainfold be sure and wrap it before its installed. Its alot easier and you'll get a better job. It also be a good idea to have some sort of shield to protect the wrap when the belts come apart again. Without it when they start thrashing around it will make a mess of the wrap. Make sure those belts are tight enough. I know they say you can over tighten but them I have never found that to be a problem. All that being said, my guess is that there is too much restriction in the blower plumbing. This causes a lot of pressure against the blower and that makes the belts slip no matter how tight they are. Call me sometime and I can show yoy how I fixed the belt problem on my PowerClean unit. Shane