[Vwdiesel] coolant burping vw pickup

[LBaird119 at aol.com]

  You "burp" it initially with the system closed.  : )  Fill and all just 
like you 
did and then warm it up until the fan cycles but be sure the heater is 
on but the heater fan OFF and the reservoir cap off.  Then shut it down, 
wait about 5 minutes and slowly remove the cap.  Then you can refill.  
When I was running a really hot stat I had this problem when I ran 
straight water in it.  Ended up with a blown gasket.  Not positive 
which came first but the stat would never open with straight water in it.
  You might have a buble, you might have a problem.  Once you get a 
complete cycle in it though, you should be able to run it with the cap 
off.  If it still does it then you either have a bad stat, combustion leak 
into 
the coolant or a stubborn air bubble.  Try a couple more cylces and if it 
still erupts then look for the other possibilities.
     Loren