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
4 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
1992 Chevrolet Lumina162,000
Temp guage bounces up and down rapidly. Even when engine is cold
Temp hand going up and down but not over heating
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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