Similar issue. The EATC would be off and all the sudden I would get hot air out of the lower vent by the gas pedal. I had to turn on the auto then shut off. 10 miles later the same thing. Dealer replaced EATC control head.
Thank god for the Ext Warranty!
02 F150 Super Crew Lariat FX4 White & Silver
5.4 /w Roush Cold Air Intake & K&N filter
Flowmaster Cat Back
JBA Silver Cat4ward Headers
Rancho Steering Stablizer
Hellwig Rear Anti Sway Bar
Outland Sport Bumper Guard
Superchips 9100 Micro Tuner c/o Troyer Performance
Underdrive Pullies c/o Troyer Performance
Mag-Hytec Trans Pan