Temperature Gauge: Testing and Inspection

This temperature indicating system consists of a sending unit, located on the cylinder head, electrical temperature gauge and an instrument voltage regulator. As engine temperature increases or decreases, the resistance of the sending unit changes, in turn controlling current flow through the gauge. When engine temperature is low sending unit resistance is high, current flow through the gauge is restricted, and the gauge pointer remains against the stop or moves very little. As engine temperature increases sending unit resistance decreases and current flow through the gauge increases, resulting in increased pointer movement.

TROUBLESHOOTING
Troubleshooting for the electrical temperature indicating system is the same as for the electrical oil pressure indicating system.