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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 Ford FOCUS III?

No blowing from vents. Slow loss of refrigerant

Q: How to fix Air conditioning stopped cooling / no response to AC button in Ford FOCUS III?

Users of these cars experienced air conditioning failures when parked and sometimes engine overheating. The diagnosis showed that the dual radiator fans control module was not working. The lack of wind through the condenser resulted in a huge increase in pressure (above 400 PSI), after which the PCM cut off the compressor. The solution to the problem was diagnostic verification of the engines and the final replacement of the fan assembly with the PWM module.

in Ford FOCUS III (2011-2012)

Symptoms

No blowing from vents
Slow loss of refrigerant

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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

IV - (DEH)

Refrigerant: R1234yf Amount (g): 430-480g Oil: PAG YF ISO 46 Oil (ml): 120 - 140ml

IV 1,0 i EcoBoost/1,5 TDCi/1,6 TDCi

Refrigerant: R1234yf Amount (g): 530g Oil: WSS-M2C300-A2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 130ml

IV 1,5 i EcoBoost/2,0 TDCi

Refrigerant: R1234yf Amount (g): 625g Oil: WSS-M2C300-A2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 110ml

See full specification

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Air conditioning stopped cooling / no response to AC button

Symptoms

A/C Technical Specifications

Other problems in FOCUS III

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