OK here's a new problem for me to try and fix on the wife's X. At first I thought it was her imagination, but I have experienced it. The heater doesn't always blow hot air. Sometimes she can drive to work, about 20 miles, leave it on full blast, and it won't get hot, a little warm thats all. But sometimes it will blow hot like it should and burn my hand. I have checked the anti-freeze, the resivior tank is full. I don't see any leaks, the only thing I can think of is maybe there is a restriction somwhere?? Any ideas of what I should check, is this a common X problem, hopefully with an easy fix?? Thanks in advance guys.