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I took the blower motor out, hoping I could get a little access to the evaporator coil. No such luck. After I got the rest of my A/C going I thought the blower did not blow very hard so I checked the resistor block. When I removed it a few leaves came out with it. I stuck my finger up in the hole and could touch the evaporator coil. It felt like velvet from the thick coating of dust. The dirt was thick at the bottom of the plenum too. Though it was just a ~1 ½” X 3 “ hole I was able to do a pretty decent job cleaning it. I used a old toothbrush (I had to cobble an extension onto the handle), laid under the hole with a flashlight and brushed the whole surface clean. Then I got an 1/8” brake line, made a special blower attachment for my air compressor blow gun, and blew the whole coil out. I again laid back and used the flashlight so I could see that I was going up and down each set of fins. I put the resistor block back it (It needed a good cleaning too) and turned on the air. I big cloud of dust came out the vents. I does blow much harder now. I sure it will cool better too.

P.S. The brake line air gun mod is about 10” long with a 90 degree bend on the end so you can blow straight through the coil.

I posted an exploded view and some other pics in this thread of the 3rd Gen HVAC.

http://www.ramforum.com/f76/blend-do...rite-up-12723/

There should be a drain under the evap core so make sure it's clear and draining. With that you can use fluids to help as it should drain out. They do make a foaming spray but i've never used it before so can't comment on it's usefulness. Google "evaporator core foam cleaner" and you'll find a few different brands in the links.

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2008 Dodge Ram Quad 4.7
Mods: K&N Cold Air Intake, Debagded, Husky Liners floormats, McGaughy 2/4.5 lowering kit, Dynomax UltraFlow SS muffler, dual exhaust rear exit, painted calipers, Front seat heaters, 110 VAC inverter, smoked 3rd brake light, superchips tuner