Goofy guage

[mlddodge]

This may have been talked about many times before but,when I drive my 91 Dodge anything above idle speed the temp guage reads on the cold end. As soon as I let up on the throttle the temp guage moves up half to three quarters. Is this normal or is there some thing wrong?

 

[BCaldwell]

goofy gauge

middodge, not an expert for sure but sounds like an electrical problem loose contact or bad ground I don't think your gauge should fluctuate I know mine doesn't Bill

 

[ETOBICOKE]

Temp Gauge

Your temperature sender uses a ground return to make the gauge work. The gauge is supplied power (+) from the ignition switch and the temperature sender functions as a variable resistor connected between the gauge and engine block (-). Several possible areas could be causing the problem, the sender could be bad although it's not likely. The wiring between the sender and the gauge could be damaged or shorted. The ground between your engine and chassis could be poor. The coolant level in your engine could be low and not always in contact with the sender unit.



Neil