This happened to my 99 ford expo 4x4 and i went threw two processes in order to get it to work, first, i got info offline that told me that the door that switches from heat to cold gets stuck sometimes and to turn your blower to the highest setting, with the control on panel, make sure the truck is warmed up so that you will be able to tell the difference in the air temp, try using different techniques turning the temp knob from hot to cold, i did this and it finally started blowing cold air, soon after, step two, i went to my local garage and got 2 cans of freon added because the air would not cool for crap and after that, ive been good to go! The price of the freon added was like 90.00 bucks- 70 for a leak test and 20 for the two cans. Hope this helps!! GOOD LUCK!! | 
Ac Blows Cold In Rear, Hot In Front 
Linear Mode
