I have a 2010 Ranger XL which replaces my 1990 Ranger XLT. The 1990 had an on/off switch which allowed you to use your fan controls for fresh air in the cab at times when the air was not needed. The new beast doesn't have the switch and it seems that the air is on all of the time. No matter where I put the control, when the cold/hot is at cold, I get the air conditioning. The owners manual doesn't give me any clues. Help! Dave