Does the aux. water pump to the heater check out OK? Other threads, including http://www.peachparts.com/shopforum/showthread.php?threadid=15038&highlight=auxiliary+water+pump
indicate that the monovalve may be going bad, or that the pushbutton control unit is marginal. apparently a failing aux. water pump can 'use the pushbutton unit as a fuse' and kill it. If it is the aux water pump, it should be a relatively easy diagnosis. The monovalve or a combination pump/pushbutton problem could be more of a problem. Good luck!
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John
2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)
Click to see 87 300E
Last edited by JCE; 11-21-2001 at 07:43 PM.
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