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What causes fluctuating temperature gauge

  

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Hey Scotty,

I bought a 1991 Geo Metro convertible with a 1.0L. Just for a fun, inexpensive hobby car to play around with.  The guy I bought it from said his dad's a mechanic and had the head milled, due to an overheat.  The car runs well, but the temperature gauge will float between 1/4 to just over half.  Not consistent.  What may cause this fluctuation?    


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Thermostat, coolant temp sensor, weak coolant, head gasket.....


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