I think this needs work -- cooling system pressure ranges from a slight
vacuum to close to 15 psi when the cap starts venting.   All of these
pressures are normal under some conditions, and abnormal under
others.  Takes an expert system with access to other conditions (outside
temp, motor load, rpm etc) to decide whether a given condition is a problem.

david

.At 05:32 PM 2/1/2001, Rico Dagastino wrote:
>There has been much discussion on the list lately about installing a pressure
>gague to monitor the pressure in the cooling system to detect unnatural
>increases in cooling system pressure.  A simpler modification to detect loss
>of cooling system pressure as a result of catastrophic hose failure, etc.,
>would be to install a pressure sensor in one of the bleed lines in the engine
>compartment.  A sensor used for detecting oil pressure would probably be
>compatible.  Install an LED with a resistor to drop the voltage to an

David Beierl - Providence, RI
  http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage"
'85 GL "Poor Relation"