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Low Coolant Indicator Always On

  1. Turn ignition switch to OFF position. Disconnect coolant level switch connector. Start engine. If LOW COOLANT indicator does not illuminate, go to next step. If LOW COOLANT indicator illuminates, check for short to ground in circuit No. 68 (Yellow/Black wire) between coolant level switch and instrument cluster Green 32-pin connector C1, terminal D14. Repair as necessary and recheck system operation. If circuit is okay, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Recheck system operation.
  2. Turn ignition switch to OFF position. Using DVOM, check voltage between coolant level switch harness connector terminals "A" (Black/White wire) and "B" (Pink wire). If battery voltage does not exist, go to next step. If battery voltage exists, check for poor terminal contacts at coolant level switch. Repair as necessary and recheck system operation. If contacts are okay, replace coolant level switch. Recheck system operation.
  3. Check for open or high resistance in circuit No. 239 (Pink wire) between coolant level switch and instrument panel fuse block. Check for open or high resistance in circuit No. 251 (Black/White wire) between coolant level switch and ground. Check for poor terminal contacts at engine coolant level switch. Repair as necessary and recheck system operation. If circuits and contacts are okay, replace engine coolant level switch. Recheck system operation.
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