it is a 16v quad 4. It just seems to randomly overheat. Sometimes it kicks up to almost 220 and then it drops back down and kind-of bounces back and forth. A couple times in the past couple weeks it has gone over 220 and I have had to pull over and add coolant. This has been when we have driven it for longer distances around 45 minutes without stopping.
I have not changed anything yet because I keep hearing different reports of what may be causing it form just replacing the radiator cap to having to replace the head gasket. Just wanted to see if there are any known solutions.