6bc2485b-3788-4f36-9c6f-237ccb8398eb.png | Full & Free

When testing the clutch connector, a Pulse Width Modulated (PWM) voltage may be observed, rather than a simple 0V or 14V signal.

The core issue involves an AC compressor not engaging, resulting in error code , which indicates a potential issue with the refrigerant pressure sensor or excessive system pressure. Key Troubleshooting Steps & Findings

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. 6BC2485B-3788-4F36-9C6F-237CCB8398EB.png

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?

A/C compressor not engaging and code 80436E - testing procedures? When testing the clutch connector, a Pulse Width

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

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. If you can share the following, I can

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