Test N: Coolant Temperature Gage Is Inaccurate

Disconnect the Coolant Temperature Sender connector. Connect one red clip lead of the J33431 tester to the harness connector DK GRN/WHT (135) wire and the other to ground. Adjust the resistance dials of the tester to 1500 ohms and then 55 ohms. The Coolant Temperature Gage should show COLD and then HOT.
^ If the Coolant Temperature Gage reads correctly, the wiring and gage are good. Replace the Coolant Temperature Sender.
^ If Coolant Temperature Gage does not read correctly check DK GRN/WHT (135) wire for an open. If wire is OK, replace the Instrument Cluster.