Living on 8th fl of apt bldg. Maintiance only handy men.Nepra thermostat. Bld. Has a boiler. When sun gets on my side, sun gets trapped in walls due to no insulation, gets behind thermostat and air won't shut off. They found out I'm moving, but it won't be for a few months. What wire do I disconnect from thermostat or blower motor in wall to stop air? Also vents on wall are above near ceiling and give me headache.

Since the problem is too much air conditioning, why not just turn the thermostat off, or turn it to heat mode? In heat mode if the temp in your apartment is above the setting it will not come on.

How do I disconnect air from thermostat in apartment bldg.

Unless you own the apartment, you do nothing, you tell maintenance. It is not your property