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Air conditioning stopped cooling / no response to AC button

Q: What are the symptoms of Air conditioning stopped cooling / no response to AC button in BMW Seria 1?

No blowing from vents. A/C does not react to control panel settings

Q: How to fix Air conditioning stopped cooling / no response to AC button in BMW Seria 1?

24-hour charging via cables OR replacing the old battery with REGISTRATION/ADAPTATION of the negative IBS terminal in ISTA.

in BMW Seria 1 (2008-2008)

Symptoms

No blowing from vents
A/C does not react to control panel settings

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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

(F40)

Refrigerant: R1234yf Amount (g): 450-500g Oil: PAG YF ISO 46 Oil (ml): 120 - 140ml

(F20/F21)

Refrigerant: R134a Amount (g): 500-550g Oil: PAG 46 Oil (ml): 120 - 150ml

See full specification

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Air conditioning stopped cooling / no response to AC button

Symptoms

A/C Technical Specifications

Other problems in Seria 1

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