Temp gauge on 2004 Holden commodore

stevie1, Jul 29, 2:49am
Goes up an down , so I'm driving along and the warning light comes on and the gauge is on max then all of a sudden goes back to normal then randomly it climbs above half way then goes back to normal again.
Water level is fine and there are no leaks which I can see

singing1, Jul 29, 2:55am
Stuck thermostat

pettal, Jul 29, 3:05am
buggered temp sender !.

peanuteater, Jul 29, 11:02am
air insystem!