[Vwdiesel] Coolant flow through stock oil cooler/heat exchanger

[82 Diesel Westy]

Great explaination Sandy!, I learn something again
today.  Thanks.  Now, how do I retain that for when I
need it.

Bryan
--- Sandy Cameron <scameron at compmore.net> wrote:

> At 01:47 PM 16/11/04 EST, you wrote:
> .  
> >After looking at the system and attempting to draw
> a coolant flow diagram, it 
> >seems that the only flow through the oil
> cooler/heat exchanger is by
> thermosiphon 
> >when thermostat is closed (therefore doing nothing
> to warm cold oil-actually 
> >a detriment), and either hottest coolant flowing
> through "cooler" or 
> >thermosiphon after thermostat is open.  Can this be
> correct. 
> 
> Not quite. The water pump is arranged so when the
> thermostat is closed, it
> is pumping coolant throught the block, head, heater
> core, and bypass, full bore.
> Hence the only reason the heater works in winter
> (and it sure does)
> Further, if you ever have a plugged rad or stuck
> thermostat, the heater core
> with full vent fan, is enough to get you home
> without a boilover. I've done it.
> 
> The thermostat operates TWO valves, the obvious one
> that opens the radiator
> return passage into the pump,, and the extra disk on
> the other end that
> closes the bypass at the same time.
> 
> Sandy
> 
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=====
Bryan Belman, Pt Pleasant, NJ
04 Jetta Wagon TDI PD, 100hp, 5sp
Restoring 82 Diesel Weekender from my old rusty 82 Westy 1.9NA
90 Audi 200, 2.2L Turbo FWD
70 Type 1 stock Beetle