Hello forum,
I have read all the post for no frt heat but none really match my symptoms so, without wanting to be re-dun dint, here goes.
99 expedition with 5.4 I have no heat or a/c in the front. The blower motor is working correctly. It only blowers ambient temp air all the time, cold in winter and warm in summer. I do not know if a/c compressor is working. The vehicle belongs to my 91 year old father. He has taking it to a mechanic. The mec. suggested taking to dealer, and told him it was some switch. Not sure what switch trying to find that out now, but blend door would not stop a/c from working, would it? any advice would be great. Yes the rear is working normal and it is NOT climate control, just normal rotary *****. yes both heater hoses at firewall are hot to the touch. no smell of antifreeze, no signs of leaking on floor.

 

These are known to have the hinges to the blend door break. There are many threads here covering the broken blend door issue, search and yea shall find.

 

Please visit the HVAC FAQs, the link is in my signature below.