My mom has your same vehicle and hers is doing the same thing. I am going to pick up a cheap pair of needle nose vise grip pliers from Harbor Freight and clamp them on the heater hose. The heater control valve is allowing heated coolant to enter the heater core, so it acts like the heater and the A/C are on together, at the same time. This will save the expense of having the heater control valve replaced. Then in the fall when you need heat again, just remove the pliers.
You can see the two heater hoses going into the firewall just behind the engine. You can clamp the pliers on either hose to stop the hot coolant from entering the heater core and heating up the air. Hope this helps. Have a nice week :O)
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