Thanks for the replies guys.
The first time it boiled over, there was nothing left in the overflow tank. I could see coolant coming dripping from beneath the car. The second time it happened (at the Canberra Show), the floor was dry and the level in the bottle did not drop.
I remembered the first time, I poured too quickly and topped up above the Full mark. I was more careful the second time. Would topping up above the full mark have caused the coolant loss? Or was the 2nd time round just lucky that it didn't have enough chance to get as hot?
The radiator fan is the one running, so that's good.
I read about releasing the air from the radiator. On Sunday, I did something to what Ezin has suggested. I opened the radiator cap, started the engine and keep it running for about 10 minutes. The level didn't go down at the top of the radiator, but it rose (I guess that's normal). The overflow tank was full to start with.
I'll probably starting checking the following in this order. Some questions:
1) How do verify that the thermostat is working? The temperature guage hovers just below the middle mark most of the time, does it mean that it's okay? I'll check the rating on my current one.
2) I'ved checked the radiator cap and it looks all right. The spring is good, it doesn't get squashed; the washer is good, no cracks and still flexible. I'll get the gadget to check the exhaust in the radiator.
3) How do you tell if the water pump is gone?
I've just take some pics, will upload them when I get home ;-)
Thanks
Matt
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