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Hi Im Dave and your Tundras problem is in the defrost / vent / floor mixing box. Nothing to do with the cooling (A/C) or the heater core. Its all driven by one electric motor and depends on which gear or damper door broke. I'll try and make it easy? Under the radio and behind the middle hump blank off panel on the floor is the mixing box. There's 4 dampers, 1 motor and a **** load of plastic gears.4 dampers = defrost - vent - front floor - rear floor1 motor up above the gas pedal. 1 plastic duct feeding passenger seat1 plastic duct feeding drivers seat2 plastic ducts feeding rear floor heatCan't see the ducts for the vent or defrost. Best way is to run the truck, put the fan on low, switch from defrost to heat and listen to any noise that may happen. I had to have my employee on the passenger seat while I was under the dash listening and watching.
do you still need help with this issue?
give me a few and i'll get back to you.
Not for the faint of heart or technically/mechanically challenged. the whole dash has to come off, steering column also to get to the airbox to access the actuators. this is for a 2007 but is the same for your year.