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Originally Posted by MercFan
What is the ACC servo - and why is it so evil... what type of exorcism process cures its demons?! DYI replacement or repair?!
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They are more costly to replace than the 126 (and other models) ACC and the originals don't hold up. The servo is what controls all of the air/heat flow. Do a bit of searching on here and you will find lots of info.