Air locks in the system or water pump (or possibly a head gaskett). You will need to find a way of getting rid of the air locks. Some engines have air bleeds in them, if yours has one remove it and fill the coolant bottle until water runs out, then replace the bleed. If you dont have a bleed find a sensor near the top of the engine in the cooling system and follow the instructions above. If no air comes out then remove and inspect the water pump. If all is ok with the water pump suspect a blown head gaskett.
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Kristian
September 2005
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