Thanks guys for all your replies.

Done more checks today. And these are what I found;

1. Aux Fan:
Taken the output sensor out, heated it up with a torch and the fan kicked in perfect.

2. Water/Oil level:
Water level is correct and same goes with the oil level.

Unfortunately as soon as I drove the car, it started to smoke. The more I rev, the more it smokes but only coming out from the RIGHT side of the exhaust. Just thick white smoke. I'm thinking its definitely the Head Gasket is gone (the right side of the engine head).

What puzzle me now is with the fan. Can somebody tell me that the lower hose on the radiator suppose to be HOT or COLD. B'coz when I touched it, it was so much colder than the top hose. I would be very much obliged if somebody has a diagram or picture to show on how those hoses suppose to be connected, especially for the ATF Coolant Housing.

BTW LPG means Liquified Petroleum Gas. But at the moment I'm running it on Petrol