The red blinky on my temperature gauge sometimes refuses to go out after
startup even though the sensor is immersed in coolant.  I understand from the
Bentley manual that the light is activated by two conditions, the first is
when the coolant in the tank is low, the second is when the temperature gauge
reaches maximum.  How do I isolate the cause of this malfunction  and correct
it?

Rico Dagastino
Munford, Tn.
84 Vanagon GL