Test I: Coolant Temperature Gage Accuracy Test

Disconnect the Coolant Temperature Sender terminal. Connect one red clip lead of the J-33431 tester to the harness terminal DK GRN/WHT (635) wire, and the other red clip lead to ground. Adjust the resistance dials of the tester to 1365 ohms, 93 ohms and then to 55 ohms. The Coolant Temperature Gage should indicate C, midscale, and then H.
^ If the Gage indicates correctly, the wiring and Gage are good. Replace the Coolant Temperature Sender.
^ If the Gage does not indicate correctly, check the DK GRN/WHT (635) wires and WHT/BLK (235) wires for high resistance. If they are OK, replace the Instrument Cluster.