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Here are the instructions to replace the Evaporator Core.
Note: The instructions don't say to remove the Inner Finder Well, If you remove it, it will make getting to the lower bolts for the evaporator box easier.
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The labor guide shows 5.1 hours, but I have done them in under 3 hours.
You do not have to replace the acc/dryer just pull it off and plug the holes if it will be off for a while.
It is common for the Evap to go bad.
There is no oil amount listed to add back in in the repair manual. Normally I will add about 2 ounces to the Evap.