I did some diagnostics on Friday of last week. At the outlet of the pump, I'm getting a nice high-pressure stream. By the time it gets to the inlet of the mixing elbow, it's still a stream but it's lost quite a bit of pressure. I wasn't able to test the mixing elbow directly and a friend who owns a auto repair shop told me that no one "tanks" radiators anymore, so I'd have hard time finding a place to get it done. My current thought is to hook up a water supply directly to the mixing elbow and see if we get any water flow out of the exhaust pipe. Any danger of the water backing up into the cylinders?
As far as the block and head are concerned, I doubt it would hurt anything to flush the system with a solvent. I've owned Mondial for 14 years and know that it's never been done before. Having never seen Marsolve in a chandlery, I stopped by Fawcett's (aka Tiffany's on the Severn} figuring that if anybody know of it, they would. Lo and behold, they never heard of it...and referred me to an auto parts store. Where do I find Marsolve?