Temperature door will not move.......

[dmjlambert]

It is not difficult, just takes time. Make sure the AC is not charged by pressing the pins in the shrader valves in the charge ports before taking loose the fittings. Remove the passenger side inner fender. Remove the bolts inside the cab around the heater core housing. Make sure engine coolant is cool and not under pressure. Remove the heater core hoses. Remove the bolts in the engine compartment around the evaporator housing.

If you want too much to read, here is what I did: https://67-72chevytrucks.com/vboard/...d.php?t=790246