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Overcharged AC systems can cause this error, as excessive pressure prevents the compressor clutch from engaging.

For further assistance, it is recommended to scan for the specific 80436E code using a BMW-specific diagnostic tool to verify the refrigerant pressure sensor readings. 6BC2485B-3788-4F36-9C6F-237CCB8398EB.png

When testing the clutch connector, a Pulse Width Modulated (PWM) voltage may be observed, rather than a simple 0V or 14V signal. Overcharged AC systems can cause this error, as

If you can share the following, I can offer more tailored advice: What is the of the BMW? Have you already scanned for codes (specifically 80436e)? Are you seeing any abnormal noises from the engine bay? If you can share the following, I can

Replacing the clutch, serpentine belt, tensioner, and idler pulley may be necessary if the compressor itself has failed.

Some BMW models (specifically noted in a Bimmerpost forum ) have clutches that may spin even when the AC button is off, as long as the HVAC panel is illuminated.

A/C compressor not engaging and code 80436E - testing procedures?