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The air conditioning does not cool and irregular operation of air conditioning

Q: How to fix The air conditioning does not cool and irregular operation of air conditioning in BMW 440i?

The repair involves finding the leak, replacing the cooler, adding fluid and resetting (erasing) computer errors. A common fault due to the radiator being exposed to mechanical damage from debris from the road.

in BMW 440i (2016-2030)

Symptoms

Irregular A/C operation

DTC error codes

8011C1

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Technical diagnosis (Premium)

Recognized technical fault:

Auxiliary controller voltage instability detected

Technical analysis

Detailed analysis of HVAC controller operation parameters, CAN bus data readings, and diagnostic signal waveforms. Purchase PRO access or log in to read the full fault analysis.

Confirmed solution

Complete step-by-step repair procedure including module non-volatile memory reset, sensor calibration, and correct wiring routing. Unlock the full report to see the instruction.

Parts needed

Filters ferrite anti-interference / noise suppressor
Auxiliary starting battery (depending on cell status)

Workshop hacks

Important workshop tips for mechanics regarding bypasses without expensive control module replacement and manufacturer software service bulletins.

TSB / TPI service bulletins

TSB-24-HVAC-01TPI-2068943/2

A/C Technical Specifications

Refrigerant specifications for this model are available in the catalog.

Open refrigerant database

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The air conditioning does not cool and irregular operation of air conditioning

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in 440i

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