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Originally Posted by jcyuhn
You've likely got a couple of distinct problems. One is certainly that you need a monovalve rebuild kit. The rubber diaphragm is torn. That's why you only get heat for the first little bit, then it tapers off. Classic symptom.
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JimY,
I found an article (w/ pics) about replacing a monovalve insert on a W126, and I took a gander near my battery, and spotted it pretty much in the same place! I may well be able to do this one myself.
Thanks again for the pointers.