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Ah-ha, the additional details say don't tear into the control panel quite yet....
First the A/C:
A common problem is that the windings inside the compressor clutch start shorting out with old age, so you start blowing fuses when you turn on the A/C. Don't forget that when you turn on the defroster, it also triggers the A/C compressor on, so - blown fuse again. I don't know about the whole circuit breaker thing, but it sounds like kind of a bandaid fix. You really need to see if the A/C clutch is drawing too many amps. If so, you may be able to pick up another clutch somewhere or replace the entire compressor (more $).
Now the heat:
Blowing cold air can be caused by a) low coolant level; b) a bad engine thermosadt, which usually shows up as the temp guage not climbing to its normal mid-point position after running the engine for a few minutes - if guage stays down near "cold" replace the thermostadt; c) a bad heater valve - it's located inline in one of the heater hose near the back end of the engine by the firewall and is operated by a small vacuum hose from the control panel.
There could be some other causes for the "no heat" but this is a good starting point. Hope this helps by providing a little food for thought.
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