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While at a stoplight, my GS400's idle started going up and down, then the AC started blowing hot air. Now when I turn on the A/C, as soon as the compressor attempts to start, the engine shuts off. Does anybody know what the problem is? If it is the compressor, where's the best place to get a replacement at a good price? Also if the compressor needs to be changed, are there any other parts that need to be replaced with it? Thanks in advance for any advice.

LEXSOOS

Most likely A/C compressor bearings are toasted. When compressor clutch engages A/C, there is too much stoping power coming from bad bearings which makes engine shut off itself. Engine running fine without A/C on because compressor clutch is disengaged at that time. In my opinion you might need to relace A/C compressor, it happends sometimes unfortunetly.

Good luck on fix