John;
Your bus is probably OK but if you just want to check everything out real
good for some peace of mind  here's what I would do:
1.Take the radiator to someone who can blast it out. There are a couple
of methods used; most include some combination of forced hot  fluid,
sonic waves and pressure. The core can not(usually) be dipped or rodded
out. If you flush the entire car then definitely do the above radiator
treatment because you are more likely to leave more junk in the radiator
than you take out.
2. Your thermostat is most likely OK also but you could boil it and
observe the opening temperature.
3. Assemble and fill with 50/50 phosphate free antifreeze. Remove all
air.
As for your fast idle check the coolant temp sender. The best method is
to unplug the ECU and read the resistance at the to appropriate pins back
through the wiring to the sensor. Do this after the bus has set over
night, then the sensor will be at ambient temperature. Compare to chart
in Bentley.
Drive Safely & Good Luck
Ken Lewis<Kernersville,NC>86 VW crewcab;60 T-5 Coupe

>
>Just replaced my '85 GL with an '88 GL. The '88 is running hot....
>Thanks
>
>John Rodgers
>--
>

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