If I remember correctly, you have a basement air unit in your Journey. To do an adequate job of cleaning the evaporator, I would recommend removing the unit. It's not that difficult a job if you're handy (or frugal), do a search on this forum for repairing basement air and you will find several good posts, especially from Duner. on how to remove and reinstall.
Two 5 gallon buckets are about the right height to hold the unit when it's removed and mine has a long enough power wire that I can run it outside the MH, on the buckets. Once it's out, cleaning both coils is easy.
The service manual has a diagram of what the inside of the unit looks like, the blower motors are between the coils, not underneath them.
Let us know when you get it done or if you have other questions.
Denny, Connie & Shadow (former barn cat made good)
2000 Itasca Horizon, Cat 3126B, Freightliner Chassis