2001 lincoln navigatorFebruary 17, 2015heater blowing cold air in front but heat in back coolant level is full what is the problemKeywords:blowing cold airNavigatorNo Heat1 thought on “2001 lincoln navigator” Freeautomechanic February 17, 2015 at 9:20 am Check the hoses going to the front heater core from under the hood. If one is hot and the other is cold, your heater core is clogged and will need back flushed or replaced. If both are warm(most common) then:Your Hot/Cold Mode door actuator has failed and is no longer working in the dash. This is a common failure part. Comments are closed.