Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
I am sorry that you have not been helped yet. I just came online and saw your question
Has it lost coolant, and if so, can you see any puddles underneath the vehicle or coolant sprayed inside the engine compartment?
How quickly does it overheat?
Has either a cooling system pressure test or a Block test been performed yet?
For the revving up and down, would you describe it as rhythmic in nature?
Please remember that I am not there and therefore rely on you to provide as much detail as possible so that I can more accurately help