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Message: <blockquote data-quote="brdgbldr" data-source="post: 120137" data-attributes="member: 7474">First thing that comes to mind is that the overflow reservoir is too full. The fluid level should be at the bottom line when cold and only reach the top line when fully heated up.If that is not the case, you could have air in the system. This seems unlikely though. An air pocket will expand much more than fluid.Have you replaced the antifreeze at all? Antifreeze has a life span and also, if the mixture is incorrect you could have too much water in it and it will boil causing all sorts of problems. Too little water can also cause problems. I always use the pre-mixed to avoid any issues. If you mix it yourself you are supposed to use distilled water. Contaminants, like chlorine and minerals in the water, are not good for the system.You may want to replace that radiator cap. The springs in them do fail over time.</blockquote>