- the line to the dedicated thermostat housing should not
be larger than 1/2 inch. This 1/2 inch line provides
all the heating necessary to open the thermostat in cold
- The connections to the heater circuit should not be any
larger than 5/8 in. In cold climates, if this connection is
any larger, and the heaters are On full blast, the engine may
never reach proper operating temperatures.
- The valve in the SC type bleeder line can be very small
1/4 or 3/8 inch ball valve. This valve can be closed
after the air is bled out.
Refer to Cooling System Kit - Cooling System Kits
2008 - Concept 5
Cooling System Configuration:
This past summer I
converted my 1985 Westy to a Subaru EJ22 engine For
this conversion I wanted to experiment with a further
refinement to my cooling system arrangement. The one concern
I had, about the concept 4 above, is that when both heaters
are turned Off there is no flow through the pressure tank -
thus trapping air in the pressure tank is not as efficient.
So concept 5 puts the pressure tank in the thermostat
housing circuit using 1/2in ID heater hose for the
connections. The initial filling of this system and the
bleeding was very straight forward - with no need to elevate
either end of the Vanagon.
Modified the diagram and added
a bit more info.
to Cooling System Kit - Cooling System Kits
is what my engine bay looks like with this Concept 5 cooling