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Slow loss of refrigerant or A/C system leakage

Q: What are the symptoms of Slow loss of refrigerant or A/C system leakage in Ford Focus Electric (BEV)?

No cold air from vents. Frost or ice on pipes under the hood

Q: How to fix Slow loss of refrigerant or A/C system leakage in Ford Focus Electric (BEV)?

Replacing the HV battery cooler (Chiller), O-rings and replenishing fluids (refrigerant, oil, coolant). When diagnosing, look for traces of oil/freon directly on the battery chiller module under the car. Any leakage at this point is critical to the life of the HV cells.

in Ford Focus Electric (BEV) (2012-2018)

Symptoms

No cold air from vents
Frost or ice on pipes under the hood

DTC error codes

HV battery cooling errors

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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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