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looking at Nissan fast at what's connected where, schematics may help you out seeing what goes/connects where etc.

Does it have
climate control or manuals dials?.

macca states heat enters anyway after fixing door, mine maybe suffering same problem.
have only just purchased it, but car seem a bit to warm when...

cold air position selected and hot air coming in would only mean 1 thing.
it's stuck on hot.
"edit above", seem this is incorrect after reading maccas input on hot air bypassing doors and finding...