need parts and info for ac/heater for datsun280z.

3800343

Rookie
what I have is a datsun 1978 Datsun 280z. it runs great I just cant get the heater core to blow hot air. There seem to be a bottom and top core. The bottom one gets hot and the top one doesn't. There are many parts missing from the ac and other controls on the dash. A knob for the ac? I am looking to complete the dash as well I have pics available if anybody has any advise or even a picture of a complete one would help.
 
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