I have been wondering about that.
I was hoping to be able to at least start the engine with dash out (after the blend doors and RH motor have been repaired) so I can make sure it all works okay, like you said. Do you pull the passenger airbag fuse so you don't trigger a fault code by starting the engine with airbag disconnected?
I will be replacing coolant hoses at the same time (it just seems to make life easier overall as I am replacing heater core o-rings. If I disturb the o-rings when replacing heater hoses and the o-rings leak, it doen't matter, as they're being replaced. Also I can drain the cooling system and have less coolant spill in the car when replacing o-rings).
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