Mary S Perdido , AL April 01, 2014 My window ac would keep running and not shutting off any. It was putting out cold air. The coils would freeze up. I called an ac repairman and told him what the ac was doing. He said it was the thermostat, which I thought so too, But I needed him to confirm it. So I ordered a new thermostat from Appliance Parts. I am a female and I knew nothing about doing this, but I wanted to try. I got it in. I turn the ac on and it worked!!! Read More... Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes Tools: Screwdrivers