Thanks. I had wondered why I couldn't detect any drop in flow if it was only going through either one or two pipes or none at all but then, the water pump is nowhere near like an oil pump..
I'll rip it out and see what happens


Quote Originally Posted by JDNSW View Post
The water is probably only going through one or two tubes in the core. The way to fix this is to remove at least one tank and push a thin rod through each tube. This is labout intensive, and hence likely to be an expensive option if you cannot find a replacement or do this yourself.