I suffered a few years without air conditioning in my 2003 Corolla in order not to spend a lot of money on repairs in the workshop. I figured they would tell me I needed a compressor and other expensive parts, so I decided to troubleshoot myself first. I checked the voltage on the compressor clutch wire (the only wire that goes to the compressor) and found zero volts. I then verified that all of the fuses were good by narrowing the list down to the AC switch, low pressure switch, high pressure switch, and relay. Since the relay was easily accessible under the hood, I swapped it for the horn relay and switched on the compressor! (.and the horn didn't work) So that proved the relay was bad. I ordered them and installed them. The compressor ran normally and the pressure was checked without adding refrigerant. Fabulous! They fixed it for a few bucks!
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