2002 Ford F-150 heater won't blow hot air; mixing door works and flushed heater core

I did put in my my first comment that the blend door is working. I took the glove box out then you can cut a hole in heater box then I can see blend door open and close when I switch from cold to hot and blend door is working. I did was a inferred heat gun it reads about 130 degrees f.

ok,just asking.i had a problem with my 2000 f150 4.6L a few years ago,the heater core went out.called around and people wanted $800.00-$1100.00 to replace,so i got my brother to call a radiator shop i completely forgot about.very good people,this is all they do,been in same place over 50 years.my windows were fogging up,smelled antifreeze,also leaking in middle on hump.he furnished everything,core,hoses,clamps,coolant,also backflushed the entire system all for $442.00 with a 1 year warranty.when i picked my truck up,it was in nov. and 18 degrees.i drove truck around town for a while and it was only blowing cold air.took it back and he checked blend door actuator and coolant had leaked on it and shorted out the motor,at that time it was dealer part only,$50.00,replaced it and all ok.these fords are very picky about coolant mixture and coolant type.also bleeding air out of system after filling.there is some good info on ford forums about this.hope you find problem and it is a simple thing.i dont think you want to pull dash out,8 hour job,2 people,hope not.

Where you get this done at ? I am in Henderson,ky

Horace"s Radiator & AC Service.1005 West Franklin Blvd.Gastonia,NC 28052 704-864-4336 8-5 M-F closed sat.and sun.family owned,father started buisness and passed away.now his son and daughter and 1 helper.they are very good. clean little small 2 bay place.now,i had mine done in 2009 and price probably has went up,but not sure how much or if any.google the address and it will show you the place.if you need help,call and ask for Tony.he will probably tell you some good stuff over the phone.good luck

I cut a hole in heater box to see mixing door it is working. I put heat gun in hole pointed at heater core in different spot of heater core it is the same temp off motor inlet for heater core. And with the hole cut in heater box behind glove box with the blower on with heater control on hot the mixing door is open fore heater core and up to temp it blows cold air out the hole I cut. So is there a fresh air door that is not closing?