Well, I am not seeing your reply until today. Obviously. But that is because the fluid I was experimenting with worked for a time, now it doesn't, hence the new message from me. Thanks for the feedback, the search for a solution goes on. The new message superceded the one I sent earlier and to which two of you graciously replied. Still looking for answers. When I put new Barr's into the reservoir I can see the level go down immediately which indicates either it is very low or there is a glaring leak and it's going directly onto the pavement! To be continued. D