In my 84 Westfalia, I have removed the rear, under-seat, heater to
replace the valve which was leaking from the stem. The valve is a sealed
unit, unique to the wasserboxer, according to one of our List suppliers.

In the interim, I placed  between the hoses a homemade 1/2 "U" sweated
from 4" lengths of 1/2"  rigid copper tubing while I attached the valve
to the core, being conscious of the warning from a List member to be
aware of the danger to the coolant pump by this temporary attachment.
I drained the core to prepare it for the attachment of the valve, and
obviously, upon reinstallation of the core, I will have introduced into
the cooling system a section devoid of coolant and containing an air
pocket.  I will have vented as much air as possible from the core by
accessing the bleed valve on top of the  core.

Questions:

1. Is there a way to insure the elimination of air from the historically
sensitive VW cooling system after the foregoing process without bleeding
the entire system?

2. Can anyone offer any suggestions and hints, or caveats or other
cautions on this process?

Thanks,

Tom Hanlon
Palm Springs. CA
84 Westfalia