In a message dated 98-04-23 17:48:22 EDT, hajasz@VISI.NET writes:

<< I just recently had some coolant hoses replaced and the system bled on my
90 GL. The
 problem now is that my coolant light comes on and stays on. But when I turn
the
 vehicle off then on again, the light will go out. Temperatures seem to be
fine and
 the coolant temperature is normal. Anybody have any ideas as I don't really
want to
 take her back into the shop ( my local VW gurus are so busy it takes almost a
week
 to get anything done.)  I work on my 72 VW T2 but have avoided working on my
90 till
 now because I just did not want to screw anything up.
 Any help appreciated,
 Steve Hajasz >>
 Make sure your cooland concentration is 50-50, the leved sensor in your
reseviour bottle is conductive sensitive, meaning that water is a conductor
and coolant isn't. If there's too much coolant concentration,  your control
unit for that stupid cooland light will flash because it thinks that the
coolant level is low. The best way to trouble shoot this on your own is to
unplug the connector on the coolant reseviour (the one in your engine
compartment, not the one behind your license plate) and bridge the connector
with a wire. This will eliminate the coolant concentration concern and wether
the level sensor itself is bad. If the light still flashes, you need a new
coolant gage.  As a precation after the problem is found, I would be sure the
concentration is correct and the system PROPERLY blead, and replace the level
sensor. Michael.