#1 - possibly
#2 - possibly
#3 - nope, no control valve that I'm aware of
#4 - temperature blending door/damper not working
#5 - heater hoses hooked up?
1989 F150 XLT standard-cab shortbed 4x4, 5.0L, AOD, 3.55 gears, manual hubs, 31x10.50 tires, 218K miles. Repainted Oct09. SOLD - Jan2015
2014 F150 XLT standard-cab shortbed 4x4, 5.0L, 6-speed auto, 3.55 gears, auto hubs, locking diff, trailer pkg, 5K miles.