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I have a 2001 Deville DTS with 54k on it. The ac stopped working abruptly.  I have checked the codes and the only thing coming up is B0429 ipm. I jumped the compressor and it works but won't engage with the relay. Changed relays no change. Refrigerant level is where it is supposed to be. Cleared codes and even disconnected battery overnight. Any suggestions?

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Ok I do believe that 0429 is Rear temperature door actuator position. Should not cause your AC issue. It doe not take much at all to throw that common code. It just means the position of that actuator does not match its commanded position.

Have you checked the compressor fuse? How did you jumper the compressor? And how did you verify the system has proper charge?

It could be something as simple as a disconnected pressure switch.

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