This happenned to me and it was the a/c relay, on the rear of my van,
wouldn't know where your westy's is.

>Hey all, it's been a while. I've been buzzing around the west coast for a
few weeks
>now in my westy, and am growing to have increased respect for the design of
these
>vehicles. Despite the fact that after freshening up the engine to fix an OP
problem
>which resulted in proper OP but a new "noise", after about 4K miles the
noise seems
>not to be getting any worse and I'm going to drive it till it dies.
>
>My main reason in posting was to ask advise on the fact that my fan
suddenly
>decided to be on all the time lately. I pulled into a parking spot one
morning and
>I don't think the fan was on at that point, and when I came back out after
an hour
>or so the fan was running. I pulled the fuse to keep it from running when
parked,
>but anyone have any notion of whether this is likely to be the radiator
thermo
>switch or a relay? The obvious is the switch, but is there a relay that
could be
>doing this? Which one?
>
>I'm planning to fix this tomorrow, any help would be appreciated.
>
>Happy trails to all,
>mark...