[kkaleher]

If your not leaking coolant out somewhere and you keep getting an air pocket and pushing coolant/air out into the reservoir then over heating, it can only be a couple things- 1: HG is leaking compression into the cooling system 2: radiator cap spring is weak and coolant pressure builds up and pushes coolant out. The HG can leak compression out but you not have a dead misfire, white smoke, or oil/coolant mixing, happened to one of my SRs. coolant to water mix should be 50/50 or 70water/30coolant depending where you live for freezing reasons. Improper mixture isnt going to cause your symptoms. id pressure test the system and check for leaks and make sure the upper and lower rad hoses are getting hot (good coolant flow)