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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 107 (Instrument Panel - C/K Series Pickups) >> Component Tests >> Coolant Temperature Gauge Testing & Diagnosis >> Gauge Reads Cold When Engine Is Hot

Gauge Reads Cold When Engine Is Hot

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1991 GMC Pickup, 1991 GMC Cab & Chassis, 1991 GMC C3500 HD, 1991 Chevrolet Pickup, and 1991 Chevrolet Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for blown GAGES fuse. If fuse is okay, disconnect lead connector from coolant temperature sending unit, and turn ignition on. Turn engine control switch key on. Connect sending unit lead to ground. Gauge should read 260 (HOT). If gauge reads 260, go to next step. If gauge does not read 260, check for open in sending unit lead circuit. If sending unit lead circuit is okay, replace gauge.
  2. Reconnect connector to sending unit. If gauge now reads 100, ensure sending unit connection is correct. If connection is okay, replace sending unit. After replacing sending unit, if gauge still reads near 100 with hot engine, gauge is also damaged. Replace gauge.
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