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Temperature Gauge Is Inaccurate (Astro, Safari & "S" Series)

  1. Check for shorts or opens in wiring between temperature sending unit and cluster, or for an inoperative temperature sending unit. To do so, disconnect temperature sending unit at engine. Connect one lead of Instrument Panel Tester (J-33431) to Dark Green wire and other lead to ground.
  2. Turn ignition switch to "RUN" position and set tester resistance dials to 1400 ohms. Temperature gauge should read cold. Now set resistance dials to 400 ohms. Temperature gauge should have 7-8 segments lit. Finally, set resistance dials to zero (0) ohms (55 ohms on "S" series). Temperature gauge should read hot.
  3. If temperature gauge responds correctly, replace temperature gauge sending unit. If gauge does not respond as indicated, check Dark Green wire between temperature gauge sending unit and cluster. If wire is okay, replace inoperative cluster.
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