Need a little help/info. 2004 Explorer XLT 4.0, 152K miles, 4x4, second owner. I bought it with 20K miles. The a/c and heater cut out when the engine has a load on it. Up a hill, it cuts out and comes back on when load is gone. Speed up to pass or get on hiway, cuts out and comes back when I maintain speed. Now I have OUTSIDE cold air flowing through the glove compartment. The passenger side is freezing and the dash is as cold as ice. The rear heat and a/c are fine. Help me out please. Thank you.