I am currently a victim of Chrysler's flawed Climate Control system. The servo is cracked, and it does not function other that when on Defrost. Am I correct in my assumption that heat from the engine bay cracks the plastic base of the servo, causing vacuum to leak out, and causing the servo to not function properly?

I saw a w116 in the junkyard and it had the evil servo. The P.O of the car filled the cracks in the housing with some sort of putty. Would sealing the cracks mysteriously cause the servo to function again, without the vacuum leak? If it's a good idea then maybe I should try it. Most likely the servo is fried and putty won't fix it, and I'll spill antifreeze everywhere by taking it out. When I push buttons on the control panel I hear flaps open if that means anything. I could buy the 700 dollar digital servo and be done with it, buy a servo with an aluminum housing for an unknown amount of money, or a used one that won't last too long. Should I try to "repair" the servo, or forget it and fix it? You will probably suggest the latter but I'm open to ideas .

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1980 240d
1999 SL500