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Old 11-24-2002, 11:16 PM
psfred psfred is offline
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
I'm not for sure, but I believe the left hand side goes straigh to the heater core and the right hand side goes to the aux pump (by the battery) and monovalve.

Could be any of a number of things, including a bad monovalve, leaking core, or dead aux pump.

My money is on the monovalve and/or the pushbutton control unit -- if either fails, it can give full heat all the time.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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