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: 100,500 (86,000–115,000)
Electrical & Lights affected: 3.1L V6
6 model years affected: 1990, 1991, 1992, 1993, more1996, 1999
7 people reported this problem
2 people shared problem details
1996 Chevrolet Lumina115,000
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
My brother had this problem too with his 1997 Lumina- 98k. Randomly started one day. Doesn't bother us anymore, just really annoying.
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