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Press and hold the "Off" and "Warmer" to get into the system, once there use the fan/blower motor controls as follows: the High Fan button for "Yes" and the Low Fan for "No." Scroll through to you get to any A/C Codes. It should eventually ask "Clear Codes" and hit the High Fan button for Yes. Once cleared the A/C Compressor should come on, providing nothing else is wrong. You can use this to access all vehicle codes for engine and body computer systems. Or use a scan tool.

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