Charles:

I recall getting the buzzer + coolant light combo just once, when the
coolant distributor blew apart on the highway and my bus dumped a lot of
coolant in a short distance.  By the time I pulled over the coolant
level was at the bottom of the reservoir, so I'm thinking (without
trudging out to the garage to check the Bentley wiring diagram) that
your problem could be a bad coolant sensor in the tank.  This could be
caused by a dead or dying sensor, or, I recall, by an incorrect
water/antifreeze mix in the coolant system.  Search gerry for "coolant
sensor" and have a browse through the collected wisdom on the subject.

Best,
d.

--
1990 GL -- "Mudskipper"

> Date:    Tue, 1 Sep 2009 08:32:23 -0700
> From:    Charles Nighbor <cnighbor1@COMCAST.NET>
> Subject: blinking coolant indicator light on 91 Vanagon auto
>
> Help the blinking coolant indicator light on my 91 Vanagon Auto Multi =
> van comes on and buzzes at interment times. And the engine is not over =
> heating. I know there are at least three sensors to register hot engine =
> and or hot coolant. Is the air conditioner interconnected. Because it =
> worked, didn't work than worked when one of coolant hoses was just =
> replaced and now doesn't work. How would you determine which sensor is =
> the bad one. Computer engine scans don't nessecary include all sensors =
> on these engines. I had this problem 6 to 8 months ago than it went =
> away.
> Any ideas
> Charles Nighbor