Since I put the tach in I ran a couple of tests on my coolant leak problem.

I followed the Bentley instructions, parked the van on an incline, front of
van about 4" higher than back.  Opened the front bleeder valve and the rear
bleeder valve, ran the van at 2000 rpm until coolant started flowing freely
from front.  Closed front valve, waited about 10 minutes and still nothing
from rear bleeder valve, (both coolant hoses below the van were hot, and so
was the hose that the rear bleeder valve is on) so I removed my penny from
the throttle and let it go back to idle, as soon as it went down from
2000rpm I watched the coolant level in the expansion tank start to
skyrocket! Still nothing from the rear bleeder valve.  It started
overflowing from the top of the expansion tank, there's a little nubbin at
the very top of the expansion tank which I suspect is a vent, and that's
where the coolant leak is coming from.  This all happened within about a
minute of dropping the rpm's from 2k to idle...  The coolant was bubbling as
I watched it rush back into the coolant tank.

Any suggestions or ideas?

Thanks,
David / NJ
85 Wolfsberg Westy "Beatrix"
http://home.comcast.net/~maurio11/index.htm