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Seems it may take some time for this saga to play out... It was warm this weekend so I took some time to replace a dead engine block heater and figured that while I had the coolant drained I would put the extra heater core in. The placement was very difficult because some AC lines are right in the way, so I just stuck it down in a cavity and blocked off the top with some cardboard with a dryer duct on the end of the intake snorkle routed thru the cardboard. I don't think there is enough air moving thru the heater core because the IAT is only 15 to 20 degrees higher than ambient, or the same as underhood temps...hmm. I beleive this will really need a sealed system to get some heat transfer, Otherwise it is in and working. It was a pain to get the air out of the coolling system with the extra heater core.
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