High Priority 98% confidence

Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in Ford S-MAX (CJ, WA6)?

Replacing the evaporator - 8-10 hours of work. Mandatory replacement of the dryer and O-rings. At the same time, check the heater (same work, similar cost of the heater). With the board open, it is worth replacing the heater immediately if it is over 10 years old - the labor is the same, the parts are cheap. Savings: PLN 1,000-2,000 in labor if the heater failed a year later.

in Ford S-MAX (CJ, WA6) (2014-2022)

Symptoms

Musty mold odor from vents

DTC error codes

Low pressure / G395 equivalent

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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

1,5 i + 2,0 i EcoBoost

Refrigerant: R1234yf Amount (g): 570g Oil: WSS-M2C300-A2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 150ml

2,0 TDCi

Refrigerant: R1234yf Amount (g): 570g Oil: WSS-M2C300-A2 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 150ml

1,5 i + 2,0 i EcoBoost

Refrigerant: R134a Amount (g): 570g Oil: WSH-M1C231-B PAO 68 lub PAG ISO 46 Oil (ml): 150ml

See full specification

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