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Air conditioning stopped cooling / no response to AC button

Q: How to fix Air conditioning stopped cooling / no response to AC button in Subaru WRX?

Just like in older commercial cars, the problem is too large a gap in the air conditioning compressor clutch. The solution is not to replace the compressor, but to dismantle the clutch components and remove the spacers (shims) to reduce the gap to the nominal factory dimensions.

in Subaru WRX (2017-2017)

Symptoms

Air conditioning does not turn on

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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

Generacja VB

Refrigerant: R1234yf Amount (g): 500g Oil: PAG ISO 100 Oil (ml): - ml

Standard

Refrigerant: R134a Amount (g): 500g Oil: ISO 100 Oil (ml): - ml

Generacja VA

Refrigerant: R134a Amount (g): 475g Oil: ISO 100 Oil (ml): - ml

See full specification

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