Toyota offers great parts to customers. But there will be several problems after the A/C expansion valve has been used for years. The removal process for an A/C expansion valve is as follows. Drain the A/C refrigerant from the system first. Next, locate the parts, and remove the lines that are connected to the expansion valve. Finally, remove the valve after the lines have been disconnected using a pair of pliers. Signs of a bad Toyota A/C expansion valve include A/C blowing hot air, compressor failure, and A/C compressor not shutting off when turned off. It is easy to buy needed Toyota parts at nearly wholesale prices. Consumers can get great Toyota parts and services online 24 hours a day and 7 days a week.