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Looking at Evap
Don't we also replace the receiver/dryer if the system has been open to air?
You can see some of the evap when the blower motor is removed, and see all the dirt caked to the fins. I used FrostKing Air Conditioner Cleaner spray foam on that mess, and gently rinsed it out. I did this for my TE converted to r134 by the PO, and for the E300 because it was filthy (the pics below).
Also, if dye has leaked out of the evap where the copper meets the aluminum, that dye will trickle down to the base of the evap, and into the heater box under it. The dye will be visible.
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