It is most likely the thermostat. If you let your bus idle in the driveway
for 15 minutes does the temp go up? Now if you drive around does the temp
go back down?  If so then your thermostat is busted. How old is the
thermostat? They are cheap and not that bad to replace. It is probably
easier to replace the thermostat than it is to check the heater cores for
clogs anyways.

Good luck.
matthew
84 w/ a new thermostat

Matthew Pollard             http://www.uidaho.edu/~poll7356
Dept. of Chemistry               http://www.chem.uidaho.edu
University of Idaho                   http://www.uidaho.edu

On Thu, 29 Mar 2001, Melvin Mudgett-Price wrote:

> Well not quite freezing. The temperature gauge in my 83.5 Westy usually
> runs at the 12 o'clock position and takes about 10 minutes of driving to
> get there. For the last 2 days it has hardly moved past its starting
> point and the air coming out of the vents is only warm instead of the
> usual blast furnace temperature no matter how long I drive the van. The
> weather in Cleveland is around 40 degrees which is warmer than it has
> been so I know that is not an issue.
>
> Could this be a sticking thermostat?
>
> Thanks in advance.
>
> Melvin Mudgett-Price
>
>
>