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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 Toyota C-HR?

Replacing a seized/short-circuited electric compressor. FLUSHING of the entire system is required to remove any remaining conductive PAG oil before installing the new compressor.

in Toyota C-HR (2012-2024)

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

Standard

Refrigerant: R1234yf Amount (g): 400-450g Oil: PAG YF ISO 46 Oil (ml): 100 - 130ml

X10 (Wersje R1234yf)

Refrigerant: R1234yf Amount (g): 400g Oil: PAG ISO 46 YF Oil (ml): 90 - 100ml

Standard

Refrigerant: R134a Amount (g): 450g Oil: ND8 PAO 68 AA1 lub PAG ISO 46 Oil (ml): 80ml

See full specification

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