It ran continuously. It has a reserve canister as a means to reduce load when you kick something on like put it in 4 wheel, but if it didn't run, trust me on this one, the heater controls locked in the defrost mode and only ran cold air. Try driving to work in the 10 degree temps with cold air on your defroster and no 4x to get out of the snow.....
I must say that it was only the early`99 model diesels that had the electric as they went back to belt driven pump in the `00 and later models. But with 280K I figure that worked out to about 4500 hours. try to get that out of an aircraft pump... I can verify that if you need with my brother who is a Ford mechanic. Heck, if it wasn't for him I probably still would be driving with cold air :0) Fred Johnson Reno, NV Jack wrote: Did this pump run continously or on demand? If its on demand it may not last very long runninc continously.
