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I don't know the timeline on any of this. If it was just recently done, you need to check the coolant level after the engine has cooled off. Other than that, unsure what the problem is, seems like you covered all the bases and then some. Maybe a plugged condenser? Oh, is the fan installed correctly? It can be reversed (talking about the one on the pulley, not the electric aux fans).
On the heater core, if it's now getting coolant and no leak, good sign. It may be that the heater valve (mono water valve) has a tear in the diaphragm and it is heating the heater core, which is why it was bypassed. The diaphragm is available seperately and is easy to replace, it's over near the battery.
Gilly
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