Erratic temperature gauge and warning light on Chevrolet Lumina

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 114,600 (86,000–162,000)
Electrical & Lights affected: 3.1L V6
7 model years affected: 1990, 1991, 1992, 1993, more1996, 1997, 1999
10 people reported this problem
Viewing 1 - 4 of 4 problem details
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
Temp hand going up and down but not over heating
Temp guage bounces up and down rapidly. Even when engine is cold
My brother had this problem too with his 1997 Lumina- 98k. Randomly started one day. Doesn't bother us anymore, just really annoying.