Ok so I figured it's my turn to beat to death this topic. Anyhow...just wanted to say...if you are considering cleaning your a/c evaporator and haven't done it yet...do it! All 3 of my vehicles (w124 chassis, w126 chassis, and a ford ranger) had DISGUSTING build-up. The W124 was easy once the blower was out. The W126 was a little more tricky b/c I had to pull the blower out and use mirrors...then I don't even want to talk about what the evaporator looked like in my ranger...had to be a 1/2 inch of grime all over the entire thing. All 3 vehicles have a notable improvement in air flow now.

I like inexpensive and effective fixes!

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97 S500 (90,000 miles) - wife's car
87 300D (298,000 miles and a replacement #14 head)
94 Suburban K2500 - need something to haul firewood
83 300SD (343,000 miles) (sold)