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Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in Ford TRANSIT?

Decrease in A/C system performance due to refrigerant loss. The diagnosis indicated an evaporator leak. The manufacturer's solution was to replace the evaporator housing itself as an independent element, which eliminated the need for expensive replacement of the entire air conditioning housing assembly.

in Ford TRANSIT (2015-2019)

Symptoms

Weak cabin cooling

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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

Connect/Tourneo Connect 1,0 i EcoBoost

Refrigerant: R134a Amount (g): 575g Oil: WSH-M1C231-B PAO 68 lub PAG ISO 46 Oil (ml): 120ml

Connect/Tourneo Connect 1,6 i EcoBoost

Refrigerant: R134a Amount (g): 675g Oil: WSH-M1C231-B PAO 68 lub PAG ISO 46 Oil (ml): 130ml

Connect/Tourneo Connect 2,5 Duratec

Refrigerant: R134a Amount (g): 675g Oil: WSH-M1C231-B PAO 68 lub PAG ISO 46 Oil (ml): 130ml

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Hissing from vents and slow loss of refrigerant

Symptoms

A/C Technical Specifications

Other problems in TRANSIT

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