How do you fix a temperature gauge in a 93 Chevy van G20 series?
To fix the temp gauge check the temp sending unit first. A bad sending unit is a common problem with the temp system.
The G20 has two coolant temp sensors, one temp sensor is at the front on the engine, it has two wires and is next to the thermostat housing, this sensor feeds info the the vehicle ECU. The other sensor is one wire feed and situated on the side of the engine (drivers side) this gives info to the temp gauge on the dashboard.