I getting ready to purchase a 86 vanagon this weekend.  The guy I buying it
from says that he noticed the temp guage getting hotter so he stopped
driveing the van right away.  Assumeing the worst he figured the head gaskets
are bad, and decided to sell the van.  So now I'm getting for a good price.
What are some things I can check before I rip into the engine and replace the
head gaskets, from what he tells me there is no visiable sign of antifreez.
What else could it be?