Temperature gauge isn't working
I have a 01 Malibu the temperature gauge stop
working but the coolant level is still good I'm
worried what can the cause be and is there any
solution and ways to trouble shoot?
Check or replace the temperature sending unit on the engine, c if that helps.
If your heater hoses and radiator hoses are not getting hot then you would need a thermostat. Could also be the temperature sending unit as Mikbek indicates.