Coolant Temperature Gauge Inaccurate Or Inoperative

1. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Using fused jumper wire, apply battery voltage to "+" terminal on temperature gauge. Connect "-" terminal on gauge to ground.
2. Connect one lead of Gauge System Tester (014-R1063) to terminal "T" on gauge. Connect other tester lead to "-" terminal on gauge.
3. Set tester to resistance specified in illustration. See Fig 1 . If temperature gauge indicates as specified, go to appropriate PINPOINT TEST. See PINPOINT TEST INDEX TABLE  . Replace temperature gauge if it does not indicate as specified.

Fig 1: Testing Coolant Temperature Gauge (Probe)

Courtesy of FORD MOTOR CO.