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Temperature Gauge

  1. Allow engine to idle with all accessories off, until thermostat opens and coolant temperature stabilizes. Gauge pointer should register in lower half of normal band.
    NOTE: DO NOT apply 12 volts or ground directly to temperature sender terminal during tests. Sender, Instrument Voltage Regulator (IVR) and gauge will be damaged.
  2. Disconnect gauge lead from terminal at sender unit. Connect lead of a 12-volt test light or positive lead of voltmeter (20-volt scale) to gauge lead that was disconnected from sender unit. Connect other lead to a good ground.
  3. Turn ignition on. A flashing light or fluctuating voltmeter indicates instrument voltage regulator is good and gauge circuit is not interrupted. If a pulsating voltage is shown but gauge is not accurate, perform TEMPERATURE GAUGE CALIBRATION test under TESTING in this article.
  4. If light stays on, or voltage reading is steady, replace IVR. If no voltage is indicated by voltmeter or test light, check for an open circuit in IVR, gauge windings, or printed circuit.
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