I agree with all above....its a 10 minute no brainer, but just a word of caution...

To be honest, I don't remember the details since its been a few years since I have done this, but I seem to remember in some of the older posts here from very knowledgeable individuals that you want to avoid frying the climate control ECU (elect. control unit) when working on the monovalve. As I said, I don't remember the details (is the wire hot when the car is off? how can you actually fry the ECU? or maybe its the pushbutton unit that can be fried? etc.). Regardless of the details, be very careful with the electric leads to the monovalve. As with most work on cars, its a good practice to disconnect the battery as a routine safety measure (most of us don't do this, but we should). The electric leads are brittle, and you just don't want to run the risk of shorting something here and having to replace an expensive and hard to find ECU or pushbutton unit.

Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)