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Message: <blockquote data-quote="wc9922" data-source="post: 249247" data-attributes="member: 6000">These BMW M50/52 engines need religious care of the cooling system. The heads are very sensative to temperature spikes. I learned my lesson cause it just happen to my car! Although not overheated but the rad cap failed and was letting out water. It was lucky it happened in a petrol pump and not in abloody jam. The whole cooling system change cost me quite a bit of money but I didn't know how well the previous owner took care of the care so I just changed a whole lot. should last another 4 years or 100,000 kms. Yes the advice of the bleed screw and heater switch is true. Make sure all air is relieved or you will have hot spots in the engine due to the air pockets which allows the water to change to superheated steam in the voids. This will cause some temp spike readings. This occasional spikes are not good for the cooling system and not to mention the water pump cavitation as the steam bubbles collapses.</blockquote>