Thread: Coolant flow on 1978 300D for heater and servo?
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Old 12-10-2011, 03:29 PM
biopete biopete is offline
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Location: Iowa City, IA
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So i found this . http://www.peachparts.com/shopforum/diesel-discussion/205573-early-w123-servo-bypass-described-pics.html

The pics show there is no need for a T from the coolant supply to heater core to bypass. I guess that there is a bypass built in already. But it doesn't specify what hose is the in for heater core and what hose is the out.

Everyone seems to know this but me it seems I think i'm right though, hook em up diagonally?
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1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius
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