Having done one on my Z31 ~10 yrs ago in 2* winter temps I'll tell you right now,.. you'll never, ever want to screw with the dash ever again. Buy a brand new Heater core (it's an aging/wearing part), no sense in going used. Get that thing hooked up and it'll be a great selling point if you ever sell it to someone who knows what it takes. (NOT that your goal is to sell, just sayin) Do the diagnostics as mentioned, and above all,.. check your coolant level. (low coolant = no heat)
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