Dont know if it could be an air lock or what, but fill header tank to max mark use motor and it drops to min, no signs of leaks any were this causes the low coolant light to come on if standing for any lenght of time goes back off when you move again, if the presure is released at the cap when this happens the level rises as would be expected and happens if you do 10 mile or 110 mile, as yet never lost more than that amount so dont think its head gasket but dont know any ideas or do i need to get a sniffer test done some were thanks in advance paul
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