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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.
'83 300D, 126K miles.
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