Hi oldtimeplumber! That powerflushing post is really interesting, some good points have been made by everyone. Do you have any info or web links on powerflushing method? I mean info that'd would be useful to an engineer and not just the customer. I've been doing flushing for a couple of years now for the company I work for, not just flushing, but unfortunatly they've never really gave me any formal training on it. Just gave me the gear and off i went! I do a good job as in the rads all properly heat up, i do all reconfigure work if necessary, clean f&e tank etc... But i'd love to see something i could compare my methods with. I would like to have spent time with a powerflush trained engineer initially but it never happend unfortunatly. Any help would be muchly appreciated! Thanks - andy