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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Panel - Standard & Electronic >> Testing >> Coolant Temperature Gauge Testing - Astro, Safari, C, K, S & T Series >> Gauge Reads Cold When Engine Is Hot

Gauge Reads Cold When Engine Is Hot

  1. Check for blown GAGE fuse. If fuse is okay, remove terminal connector from sending unit. Turn ignition on. Connect test light between sending unit harness connector and ground. If test light glows, go to next step. If test light does not glow, go to step  3.
  2. Using fused jumper wire, ground terminal connector from sending unit. If temperature gauge reads HOT, check/repair sending unit lead connector. If sending unit lead connector is okay, replace sending unit. If gauge still reads COLD, replace coolant temperature gauge.
  3. Turn ignition off. Using DVOM, check continuity between sending unit terminal at gauge and ground and between gauge ignition terminal and ground. Also check temperature gauge case ground. If all checks are okay, replace coolant temperature gauge.
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