At 04:24 PM 11/5/2008, The Westy man wrote:
>Hi to all,
>After not using the car for a month, now the coolant light is
>blinking.  But after I pulled the 42 relay out, it stopped.  I
>somehow have the feeling, it is not the solution.
>Anyone?

That's good news, means it's not the gauge.  Put the controller back
in, pull the plug at the pressure tank and jumper across it, then
turn on ignition.  If that makes it stop blinking, then very high
probability that all is correct from the jumper forward (to make
absolutely sure, use a 100K resistor for the jumper.

If it still blinks, short the jumper to ground and try again.  If
that cures it, you have a bad ground on the plug.

If these tests succeed, pull the sensor out and vigorously clean pins
with fine sandpaper, also check that your coolant has correct 50/50 mix.

If they don't succeed, you have a bad controller or an open circuit
in the wiring from sensor to controller.

Cheers,
David

>Zoltan

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage," '85 GL "Poor Relation"