I am for the most part mechanically inclined, to an extant. I just bought this 2001 7.3L last month with 100k on it. With no maintenance history or anything. It is my first 7.3L I had a 6.0L for a short period of time(a lot of issues) I am smelling a light coolant smell coming from my engine and threw my vents with the heat on. Coolant level is fine, no visible leaks. Any ideas on why I am getting the smell? No white smoke out the exhaust so a head gasket leak is out of the question, I assume? Any help? Thanks! Anything to look for??????