I: Coolant Temp Indicator Does Not Light When Engine Overheats
Disconnect the Coolant Temperature Switch and jumper DK GRN (35) wire to ground. Move ignition Switch to RUN and observe the Coolant TEMP Indicator.^ If the Indicator now lights. replace the Coolant Temperature Switch.
^ If the indicator does not light. check DK GRN and DK GRN/WHT (35) wires for an open (see schematic). Electrical Diagrams