Thread: Disconnect Monovalve = Heat? Why?
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Old 09-28-2008, 11:33 AM
RAYMOND485 RAYMOND485 is offline
RAYMOND485
  
Join Date: May 2005
Location: CALIF
Posts: 508
Heater valve
1984 300d
the heater monovalve is on to turn off the hot engine water
off when heat is needed, pull the plug to test the valve for heat
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