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Hello. Did the mechanic check to see if the system had enough refrigerant?
I am not sure why he thinks it's the orifice tube. Your car does not have one. Your car has a thermostatic expansion valve and that is about a half hour to replace. If you have a good charge then I doubt the accident is the cause of this problem unfortunately. I am not aware of a pressure switch under the dash. The pressure switch is in the engine compartment.
the most intense part of your AC system to replace would likely be the evaporator core which is located in your dash. But, that is a 5.6 hour job. I have no idea what he is saying will be a 7 hour job to replace.