I had the same problem, I read that trick were you turn the heater on full and run the engine with the radiator cap off (stationary) gets rid of air pockets... then installed a new radiator cap.. fixed
Do this trick and rev around 2000rpm for 30 40 seconds, and you should see that coolnat level went down if there was air inside the cooling system
Let me explain a bit better than the title. my eg cluster temp needle goes to High but when i pop the bonnet and feel around the engine and the radiator. it is actually just warm not hot... and no steam coming out anywhere. and no weird noises coming out from engine. the radiator fan spins... whats wrong with my car? head gasket blown? but i cant see any oil leaking or residue in the coolant. thanks guys. let me know what you think.
Because your hands must be heaps more accurate than the temperature gauge.
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