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sound like maybe the blend door actuator is malfunctioning and needs to be replaced they are all computerized so if the actuator is not working properly it will store a code and not allow to set climat
If this is a new problem, a temperature sensor may have gone bad. But if this is a new car to you, some Climate Control cars work this way.
Some will allow for Vent or Panel just to get air circulating, but the A/C should come on when you select A/C unless the outside temperature is too low.
For heater functions, the engine must warm up enough to provide heat. The Climate Control models will not turn on until it compares your temperature settings with how hot the engine water temperature is to provide this heat for you.
Now you may need to check the Antifreeze levels and check the temperature of the Radiator water to know if the Thermostat is working properly.
Had the same problem, replaced the ambient air temp sensor in front of the radiator. Cost is like 10-15 bucks. Don't worry if temp doesn't change right away. Took me about 5 miles and then it worked great.
Older cars sometimes have many difficult problems, especially the wires problem, it is very hard to find out which wire got trouble, I think your Olds wire got hot sometimes before and some wires connected together and by pass. Olds is GMC products, the plastic sucks easy to melt, sometimes also cause the engine over heat, because the cooling fan doesn’t work right.