I have been dealing with a conditon that I believe to
be a plugged radiator.   I have ruled out most other
cheaper fixes.   Over the past week I have isolated
the radiator at the point of the rear most end of the
big pipes and plugged them with corks and soaked the
isolated system with 0.2M citric acid for a week.
Flushing the system with hot water under house
pressure gave a flow rate about 6 gallons per second.
The first flush was very black and showed evidence of
bits of aluminum from what I am hoping to be some
after market sealer rather than the radiator itself.
After flushing the system I filled with the orange
stuff.   What I find intersting about the vanagon
coolant system is that the flow rate for water alone
is much faster than with antifreeze added.   This is
reflected well by the (temperature at idle as seen by
the gauge) TAI.
The TAI with water alone is much lower and at position
determined by the thermostat.   The low speed fan has
no problem keeping the engine temperature on the red
light dot even on a very hot day.   Once you add
antifreeze the TAI goes up above the light unless you
increase the rpm.   The TIA on a hot day(about 95)
will respond more slowly to the cooling affect of the
low speed fan.
   My question is would I be better off adding less
antifreeze and more water and perhaps adding some
after market corrosion inhibitor and water pump
lubricant?   thanks gary

__________________________________
Do you Yahoo!?
Yahoo! Photos: High-quality 4x6 digital prints for 25�
http://photos.yahoo.com/ph/print_splash