03 Chevy Impala - Why is the temperature gauge fluctuating?

LaTonya

New member
Within the last 30 days my mechanic replaced the radiator, radiator fan and themostat yet the temperature guage continues to fluctuate and eventually overheats. This appears to happen when I come to a complete stop and comes back down while driving. My mechanic is NOW telling me, it's the head gasket. After putting close to 2k in his pocket last month, I don't feel comfortable paying him another dime for another 'assumption'. Other than replacing the head gasket, does anyone know what else could be causing this to happen?
 
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