Dash temperature guage reads 250 but engine is 195 - 200

Larry Gray

Asked by Aug 11, 2014 at 06:20 PM about the 1993 Chevrolet C/K 1500 Cheyenne Standard Cab Stepside SB

Question type: Maintenance & Repair

1993 Chevy k1500 truck 5.7 engine. New water pump, engine thermostat, and radiator flushed. I checked the top of the engine and it runs at 195 - 200 degrees. I also put on a new engine temperature sender unit which is two wire replacing a one wire unit. I suspect it may be that but I don't know what the ohms should be hot or cold.

3 Answers


With the gauge pinned on the hot side, the wire coming from the sending unit to the dash gauge is shorted to ground. In other words the wire has a bare spot and is touching something metal. Or, unplug the sending unit and start the truck. The gauge should be on cold. If not that confirms the shorted wire. HTH. -Jim

1 out of 1 people think this is helpful.
Andrew Olsen

the 2 wire units will do that, they will peg out a gauge at only 210 becasue of different ohm readings. You need to go back to a 1 wire.

Best Answer
Larry Gray

I changed it to a one pin and now it is perfect! Thank you...

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