This is clear signs of low or no pressure on the cooling
system. You have a leak, somewhere. Could even be the pressure
cap. Good way to kill your engine, is to keep driving it this way.

            Eric                   86-VW4x4
            vw4x4@fyi.net          72-240z
            Pittsburgh, PA USA     1936-Chrysler

On Sun, 25 Apr 1999, David R. Paterson wrote:

> Hey Folks,
> I've been having the strangest problem with the running temp./heating
> system on my 91 Vanagon.
> For the last few months the temp. guage generally runs low, usually about
> halfway between cold and the LED. When under load such as climbing a hill
> at highway speed the needle goes up to the top of the LED. When this
> happens, the air from the heater gets COLD. Then after a while the temp.
> goes back to sub-normal and the heated air returns also.
>
> I have had to add a little Anti-freeze to the expansion tank about once
> every two weeks. I had the coolant system flushed, bled and pressure
> tested. But this annoying problem continues.
>
> Anyone have any ideas?
>
> TIA
> Dave
>