At 11:20 AM 6/26/2010 Saturday, Peter DiFalco wrote:
>I did notice a tiny hairline crack in the top of the pressure bottle.
>Yesterday the coolant light came on while pulling up a hill, fully loaded,
>running A/C, but the engine temp stayed constant.

Dear Peter,
The pressure bottle must hold pressure or the system will not work correctly.

*ANY* warning light indication on a Vanagon is an issue of STOP RIGHT
NOW and proceed no further without understanding the nature of the
problem.  I don't mean in five miles, or a quarter of a mile, I mean
NOW.  The most important reason for this is that the engine is
aluminum, and that the coolant pump is driven by the alternator belt.

Yours,
David