fuji4wd

Long time lurker, first time poster here. My 94 Loyale recently developed a problem with the air conditioning. Yesterday, it got pretty cool here, and I put the heat on low. However, the ac still blasted out of the vents while the heat was blasting cool out of the floor. Pressing bilev and defrost resulted in the ac still running. I turned off the ac completely and selected heat or bilev, but the ac never shut off. I noted from the engine load and coolness of the air coming out of the dash vents that the ac compressor was still running on these other settings. With summer winding down here soon, I am concerned about not having any heat, and not being able to use the defroster. Does anyone have any ideas or has anyone experienced this condition? I would be grateful for any tips or advice on how to correct this. I'm not a car genius, the most I can do is an oil change really, but if i have some info, I can have someone with more smarts look into it or make repairs. Thanks again.