What are the symptoms of Hissing from vents and slow loss of refrigerant in Ford Mondeo MK2?

No cold air from vents. A/C does not react to control panel settings. Frost or ice on pipes under the hood

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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 Mondeo MK2?

The automatic air conditioning was crazy - in the summer it did not cool enough, and in the winter it sometimes let icy air into the cabin even though the temperature was set to 22°C. In the self-diagnosis mode, the system returned errors 60 and 62. The diagnosis showed a failure of the small fan next to the internal temperature sensor located in the dashboard. Due to the fan being blocked or too high, the sensor was reading the incorrect (existing) temperature in the dashboard instead of drawing fresh air from the cabin. The solution was to replace the temperature sensor module with an integrated fan with a functional one.

in Ford Mondeo MK2

Symptoms

No cold air from vents
A/C does not react to control panel settings
Frost or ice on pipes under the hood

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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

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

V - (CNG)

Refrigerant: R134a Amount (g): 550-600g Oil: PAG 46 Oil (ml): 130 - 160ml

V 1,0 i EcoBoost

Refrigerant: R134a Amount (g): 530g Oil: WSH-M1C231-B PAO 68 lub PAG ISO 46 Oil (ml): 145ml

See full specification

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