I got it back from Nissan today. The service advisor assured me the heater hoses were going to be set up in bypass again because I told her I was pretty sure it was bypassed because of a failed heater core, but then I got it back like this...
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The ECT reads at 109C, so 3C higher than before at operating temperature so I'm not sure what to take from this. Heater core isn't leaking so that's good I guess, and I have heat now so that's cool too. The service advisor says it's not overheating anymore, but I don't think 109C (228F) is normal... but what do I know.
Sounds like it is running hot still. is it leaking from the heater core since they clearly didnt listen to you and hooked it up anyways? any coolant smell?
has anyone checked the radiator itself? could that need replacing perhaps its clogged or something and impeding flow. also what about the fan? is it working properly..