I recently just did this project myself. My evaporator sat uncovered for about 8 years and there was plenty of dirt in there.
For future reference you can easily remove the evaporator without removing the dash (although I know you said you would already have it out).
Absolutely be sure to flush the evaporator VERY good. Additionally, be sure to replace the expansion valve while you have the evaporator out. The expansion valve has a very small orifice in it and one little piece of dirt can screw it up.
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