---- Dennis Jowell <dennisjowell@GMAIL.COM> wrote:
> Got it. It's the coolant light going off at low idle once in a while. Will clean the 2 prongs on cap and check coolant level.
> Thanks for the info

but you said the buzzer goes off when you exit the freeway.  The buzzer has nothing to do with coolant.  It is a low oil pressure at high rpm warning.

>
> Dennis Jowell
> Scotch Hollow Farm
> Newbury,  Vermont
>
>
> > On Nov 4, 2014, at 7:45 PM, Dennis Haynes <d23haynes57@hotmail.com> wrote:
> >
> > Just be clear which light. The oil pressure warning light is next to that
> > oil can looking symbol in the center of the cluster. The coolant warning
> > light is in the coolant temperature gauge.
> > The oil pressure warning system is a bit complex. There are two sensors. A
> > .3 bar (~4 psi) normally closed is located between the push rod tubes. There
> > is a higher pressure switch .9 bar (~13 psi) normally open switch located at
> > the rear of the engine. The switches use the different logic to provide a
> > fail-safe. Defeating the .9bar switch will require connecting the signal
> > wire to a chassis ground.
> >
> > With key on, engine off, the low pressure switch will be closed causing the
> > light to blink. The high pressure switch is ignored. When the engine is
> > started oil pressure will open the low pressure switch and turn the light
> > off. Sufficient pressure will also close the high pressure switch. Above
> > ~2,000 rpm the dynamic oil pressure control board will check the high
> > pressure switch. If that switch is open you will get the light and buzzer.
> > Once latched, it will stay activated until the high pressure switch is
> > closed or the ignition is cycled.
> >
> > So your symptoms are indication a problem with the high pressure switch
> > including even having the wrong one or a marginal oil pressure situation.
> > Low oil pressure can be caused by a number of factors such as incorrect
> > viscosity, high oil temperature, worn pump or bearings, clogged oil filter,
> > oil dilution, etc. A healthy engine should be able to maintain close 10
> > psi/1,000 rpm. There are times when the Vanagon engine cannot do this but
> > not being able to maintain 12-13 psi above 2,000 rpm should get your
> > attention. A common cause for high oil temperature is overfilling. The top
> > mark on the dipstick is not the "full" mark. It is the "maximum do not ever
> > exceed no matter what" mark. At oil and filter time 4.5 quarts is all you
> > need. For the high pressure switch I am finding that much of the
> > after-market stuff is inconsistent. Go to the dealer and be sure to get the
> > correct one.
> >
> > Dennis
> >
> >
> >
> >
> > -----Original Message-----
> > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> > Dennis Jowell
> > Sent: Tuesday, November 04, 2014 3:35 PM
> > To: vanagon@GERRY.VANAGON.COM
> > Subject: Warning light
> >
> > I am trying to understand the warning light on the temperature gauge of my
> > 1988 Westy.
> > Going off the interstate the light and buzzer goes on for a second. If I
> > accelerate slightly the light and buzzer goes off. Is this telling me that I
> > am low in coolant? Coolant temperature is mid range all the time. Or is it
> > and oil pressure issue? Read my Bentley and owners manual still no
> > explanation.
> >
> > Dennis Jowell
> > Scotch Hollow Farm
> > Newbury Vermont

--
David McNeely