Fan comes on when the temperature needle is on half way. Not really, fan comes on and off when car is at running temperature and above. Didn't look at thermostat yet. This morning the car over heated again, went and let it cool down and the rad took around 700 mls of water. After this we looked under the oil cap and there was a little white gunk. Never ever seen this on this engine before. Went and got a compression tester and the car read bang on 153 across ALL cylinders. Any idea what the hell is wrong ha. Thanks lads.