really, mine comes on quite a bit... in hot southern
cali... but... maybe I need to bleed the system... so
I never thought of removing the radiator and taking it
to a shop to have them clean it... you've done that?

 >  I think it is just a poorly designed system that
works
marginally.

In the ten years I have owned my Transporter I can
only
recall the high speed fan coming on a few times. I
believe
the radiator, when working efficiently, to be over
engineered. In fact it is cheerfully retained by the
lunatic
fringe after a V8 transplant.
My point is, maybe you should consider taking your
radiator
out and having it professionally blasted out.
Personally, I
do not recommend the do-it-yourself system flush.

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