Ok my 95 v6 is having a weird problem. Its Pretty cold out here in michigan and my heat is weird, My temp gage will get really hot and it blows cold air out. then i let it sit for a bit then drive a little and it gets warm. Well im thinking either my thermostat is bad or coolant. Tomarrow i am going to flush and refill it and put a new thermostat in. Well anyway my question is What kind of mixture do you guys use coolant/water??is more coolant then water better in the winter??? and how much total should i refill in there??