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You have a 22 year old car with working ac and the original R12, you can't do less damage to the environment than you would just leaving it alone and it cost you nothing, and you have an AC for those days when it really gets toasty.
If you turn on the vents, for the first time that day, and car has been sitting outside in texas sun and heat, the air coming out of the vents will be very hot for a while until the parts in the heating system actually cool off themselves.
If the heater control valve is working properly, the heater hoses will not get hot with the selector on cold air. Turn on the valve by selecting hot air and the hoses will get hot, as hot as the top of the radiator.
The heater valve and cable in your illustration could need to be adjusted to completely shut off the flow of hot coolant to the heater core. If that does not seem to work, then just clamp off 1 of the heater hoses going through the firewall and that will shut off any hot coolant to the heater core. Releasing the clamp and temporarily disconnecting the cable will allow you to manually move the valve to see if it is closing completely, if you have to do that manually then set the valve completely shut off then connect the cable and reinstall the clamp to hold it in that position. You should see a different position of the cable in the clamp than where it was before.
regards
mech
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