![Wink :wink:](./images/smilies/icon_wink.gif)
Well, it had to come from somewhere, and a little examination showed that the problem was that the v belt has been rubbing on the molded hose that connects the expansion tank to the water pump.
![Image](https://i.imgur.com/uBWHFbJ.jpg)
I'm sure it didn't always rub together like that, so I'm going to have to find out why it started doing it. You can't see in the picture, but there is a pretty deep gouge cut into that hose, and it probably should be replaced. Does anyone here know a source for a replacement? If not, I'll have to make one up from standard bends and connector tubes, but I'd rather not if I don't have to. The original is a complicated molded part, and I'm sure it won't be easy to find.
Tom