I got a 100 ohm resistor (or so) and used it between the wire that
normally goes on to the sender and a good ground.  I found my problem to
be a BAD GROUND at the thermostat housing. If you have an ohmmeter,
measure the resistance between the temp sender's gound and a known good
ground.

Brad

mykarmann wrote:

>Hello all,
>     The coolant temp gauge on my 86 GL isn't functioning.  I believe that the sensor is OK it was replaced when the heads were done in Oct.  I've checked all connections and looked at the Bentley manual but I don't really know were to go from there.  I need to check the gauge itself does anyone know a simple test to check it without pulling the instrument cluster?
>The red light for the coolant level works and lights up fine with I place the key in the ignition.  Thanks, Mark
>
>
>