Somerset Regal L4-151 2.5L (1985)
Connector C100
4. If the coolant temperature warning indicator does not come on when starting the car and the bulb is good, check the bulb test circuit to the ignition
switch.
a.
Check 10 amp GAGES fuse for continuity.
b.
Check continuity of DK GRN(35) wire from terminal F5 of connector C100 (46 cavity) connector on left hand side of dash to ground through the
ignition switch (BULB TEST) position.
5. If the coolant temperature warning indicator does not come on for a hot engine, but does not come on for a hot engine, but does light when starting
the engine, remove the connector from the coolant temperature switch/sender. Short terminal B (DK GRN) to ground. Turn the ignition switch to the
RUN position.
a.
If the bulb now lights, install a new coolant temperature switch/sender.
b.
If the bulb does not light, locate and repair the open in the DK GRN(35) wire between the instrument panel and the coolant switch.
