The AC on my son's car wasn't cooling, and I found that the compressor clutch wasn't engaging, even with the thermostat turned down as far as it could go. I was anticipating a big repair bill, but a little research allowed me to discover that the problem was a relay that engages and disengages the clutch. This component installed easily, functioned perfectly, and saved me the inconvenience and expense for AC service at the repair shop.
What kind of vehicle do you drive? 2004 Toyota Corolla