I am in the process of going through the a/c system on a 1992 Honda Prelude (for hire). Man I wish the guy that engineered the system in the Honda had done the W123/126. This has, by far got to be one of the easiest evaporators to remove of ANY car out there. It is a piece of cake compared to the early 80's Mercedes.

I have attached a pic of the dirty evaporator. This is the reason all the car manufacturers went to a "cabin filter".

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Jim