Our '87 has been heating up to the point of the fan kicking in much
too early lately and I suspect an air bubble in the cooling system.
I did change the temp sensor II, so it's not unlikely.  So, I wanna
bleed it.

I looked in Haynes manual and they mention and show a bleed valve in
the engine compartment right on top of the thermostat housing.  If
I'm not starting with an empty cooling system, do I need to bother
with this; i.e. isn't the radiator bleed valve enough?  All other
bleeding instructions I've seen only mention the radiator bleed
valve.

Thanks in advance.

-Karl

Karl and Kristina Bloss, Trexlertown, PA
'87 GL Weekender  "Beverley"
VW shop list: http://www.enter.net/~bloss/vw/vwshops