Erratic temperature gauge and warning light on Chevrolet Lumina

The engine temperature sensor wire for the engine temperature gauge, or warning light, may touch the rear exhaust manifold causing a short to ground causing erratic operation of the temperature gauge or warning light.

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Average mileage: 113,250 (86,000–162,000)
Electrical & Lights affected: 3.1L V6
7 model years affected: 1990, 1991, 1992, 1993, more1996, 1997, 1999
9 people reported this problem
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Viewing 1 - 4 of 4 problem details
1996 Chevrolet Lumina 115,000 mi,
Car acts like it's overheating via the gauge but doesn't show any sign internally of a temperature issue. Fan still comes on, etc
1997 Chevrolet Lumina 90,000 mi,
Temp hand going up and down but not over heating
1992 Chevrolet Lumina 162,000 mi,
Temp guage bounces up and down rapidly. Even when engine is cold
1996 Chevrolet Lumina 86,000 mi,
My brother had this problem too with his 1997 Lumina- 98k. Randomly started one day. Doesn't bother us anymore, just really annoying.