I thought I had this problem when I first read your post, but it turned out to be a broken blend door. Dealer wanted $500 to remove the dash and put in a whole new plenum box. There are some DIY kits on the net, so I express ordered a heatertreater overnight and it works great! The fix is done by removing the glovebox and installing a steel replacement blend door. So if you determine the actuator isn't the problem, check the blend door!
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I would check the blend door actuator. If the door is open all the way, one direction, the air blows over the heater core. All the way in the other direction, the air blows over the evaporator. Anywhere in between, a blend of hot and cold for temp control. That explanation is a little simplistic. the info is for ford windstar.
always check the coolant first, then feel both heater hoses to see if they are equally hot.
if one hot and one cold, then the heater core is clogged
if both hot then you have a blend door problem.
on the a/c there's some time a rear unit that blow cool air even the front does not
what stopped? the air doesnt blow,if thats the case then replace the blowermotor resistor, its located on heater box on passengerside next to blower motor.hope this helps, let me know if this was the problem.
Buy used parts at car-part.com. Look on page with * to find the cheapest part. Coud be your temp blend door (#2) may not be moving back and forth. Or, you are not getting hot water to the rear heater core.
You may have to crawl under the truck and feel the heater hoses to see if they are hot. You will find a group of 4 lines, 2 for heater and 2 for a/c. If hot, you know hot water is getting back to the heater core. If not, there may be a hot water vave that's not working. Not sure if EXP. has a water valve for rear.