Quote:
Originally Posted by Richard Wooldridge
Now I have replaced both the monovalve and auxiliary water pump with a vacuum controlled heater valve ($17.00 from NAPA, 1974 Ford) and a switchover valve ($38.00 from Performance Products, 1990 Mercedes 300D). This setup works at all engine speeds, cuts the heater water flow completely off at all speeds, and gives excellent modulation all through the temp wheel range. It also looks very much like the original setup.
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Richard, this sounds very interesting.
Can you expound on it a bit. Details of the operation and the required connections.........including how the CCU ground signal operates these valves...........would be invaluable.