Grand Prix V6-204 3.4L DOHC (1992)
Temperature Gauge: Testing and Inspection
Symptom Diagnostic Tests - Gage Cluster
Test I: Coolant Temperature Gage Shows Hot at All Times
Disconnect the Coolant Temperature Sender connector. Put Ignition Switch in RUN and observe the Coolant TEMP Gage.
^ If the gage reads COLD, check for a poor connection. If OK, replace the Coolant Temperature Sender.
^ If the gage still reads HOT, check DK GRN (35) wire for a short to ground (see schematic). If OK, service the Instrument Cluster.
Test J: Coolant Temperature Gage Shows Cold at All Times
Disconnect the Coolant Temperature Sender connector. Jumper the DK GRN (35) wire to ground and put the Ignition Switch in RUN.
^ If the Coolant Temperature Gage reads HOT, check for a poor connection. If OK, replace the Coolant Temperature Sender.
^ If the Coolant Temperature Gauge still reads COLD, check the DK GRN (35) wire for an open. If OK, service the Auxiliary Gage Assembly.
Test K: Coolant Temperature Gage Is Not Accurate
Disconnect the Coolant Temperature Sender connector. Connect one red clip lead of the J 33431-B tester to the harness connector DK GRN (35) wire,
and the other red clip lead to ground. Turn the Ignition Switch to RUN. Adjust the resistance dials of the tester to 1365 ohms and then to 55 ohms. The
Coolant Temperature Gauge should register 100°F (37°C) then 260°F (125°C).
^ If the gage reads correctly, the wiring and gauge are good. Check for a poor connection. If OK, replace the Coolant Temperature Sender.
^ If the gage is not correct, check the DK GRN (35) wire for high resistance. If the wire is OK, service the Instrument Cluster.
