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Old 11-06-2013, 10:53 AM
rscurtis rscurtis is offline
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Join Date: Oct 2007
Location: St. Thomas PA
Posts: 957
The heater hose coming out of the firewall into the head is returning coolant from the heater core back to the motor.

I think you have that reversed- the hose on the head is the hot supply to the heater core. The mono valve is on the return side, as is the auxiliary water pump.
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'83 300D, 126K miles.
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