A couple of things. Your thermostat could be stuck or you have air i your coolant system. Bleed your coolant system. If the coolant is low, you can also have that issue so check for a coolant leak. If you check your oil and it looks like chocolate milk, then you could have a blown head gasket. Check all of these first.
SOURCE: Thermostat on 2002 Chevy Impala
the best thing to get is the Haynes manual for your car at advanced auto or autozone or somewhere like that and the book will tell you how to take everything apart and put it back. i think the manual is about $16.00
SOURCE: temp gauge cold and then heat turns not so hot
make sure the antifreeze is full. if so, replace thermostat and refill
SOURCE: I have a 2005 chevy Impala temp gauge going crazy
faulty stepper motors in your cluster. and its 03-06 GM vehicles that are affected. and no there isnt a glitch in all chevy cars you smoke too much u paranoid freak. you can fix this yourself for about 40 bucks. heres how i did it. click the link
http://www.naioa.com/v2/modules.php?name=Forums&file=viewtopic&t=28085&highlight=
SOURCE: Gas Gauge not working
sending unit is in the gas tank. you must take down the gas tank and remove the fuel pump/ sending unit assembly
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