So it's not overheating. You really don't know how hot it really is getting looking at the factory gauge. I have said this so many times I don't even type it out, just cut and paste. "At 220° your engine is not overheating. Is it boiling over? Water boils at 212°. A 50/50 mix of antifreeze boils at 223° and for every pound of cooling system pressure you add 3°. With antifreeze and a 15# cap, your coolant won't boil until 268°. As mentioned, air flow is the key."