A/C...if its still R12 freon, you probably can't get any from a parts house. You will probably need to take it to a shop. They can check out the system for about $50 (my shops price).
Heater...while engine is running, just unplug the vacuum line from the engine, going to the VSV (wires to it) by the heater water valve, then plug it into the heater valve. Valve should work, you'll see it move. Normal operation is that water always flows thru the heater core, except when the temp controls are set to 65*.
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