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lately i have noticed plastic over flow bottle almost full after flight when engine is cold it no longer gets pulled back into system if i try to take some out of plastic bottle and put it tank on top of  engine  tank is already full  any  help as to what is going on. i havent added anti freeze in a long time and problem just started

  • Re: excess anti freeze

    by » one month ago


    Your engine coolant system is no longer sealed. Only the overflow bottle itself should be vented to the atmosphere. Pull your reservoir cap, clean everything, thoroughly, including the inside of the reservoir and cap, and check the rubber gasket is clean and pliable or replace it.  Check all hoses and connections, refill the reservoir, set the level of coolant in the overflow bottle to “normal for your engine”, then run the engine until hot and recheck in the morning. If no change, it’s time to do a coolant pressure check of the system.


  • Re: excess anti freeze

    by » one month ago


    Is the coolant oily? You may have a cracked head, letting oil into the coolant passage.


  • Re: excess anti freeze

    by » one month ago


    That is becasue the line that feeds into your overflow bottle is collapsing and not allowing coolant to flow back through it. Change the line with a stiff one and I bet your problem goes away...This is also the simplest, cheapest thing to do first!


  • Re: excess anti freeze

    by » one month ago


    i will try that thanks but when i take the coolant out of the expansion bottle and try to put it backin the tank it wont fit  tank is still full


  • Re: excess anti freeze

    by » one month ago


    coolant only


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