If you have not already done so, check the multi-wire ground points
under the dash.  I replaced the ones in my '87 Syncro last summer, and
also had to replace a bunch of corroded spade connectors in the
process.  It solved a multitude of electrical problems in my gauge
cluster, including the temperature gauge reading too low.

Michael Snow

On 1/23/06, rsf <feller@carboncow.com> wrote:
> *       Good thermostat (tested fine)
> *       Appears to be correct level of coolant and bled
> *       Gauge slowly started creeping lower all week
> *       Heater (front and rear) work fine in 20-30F weather!
>
> What failure trend is there in the sender or the gauge?
> What test can I perform as it's almost impossible to get to the sender
> unless from the bottom and it's snowy out and I don't want to wear any
> coolant!
> 1986 2.1L Westy
>
> PS. VW engineers should be ashamed of the location of the coolant temp
> sensor and thermostat housing!
>