What are the symptoms of Slow loss of refrigerant or A/C system leakage in Volkswagen Vento?

Frost or ice on pipes under the hood. Slow loss of refrigerant

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Slow loss of refrigerant or A/C system leakage

Q: How to fix Slow loss of refrigerant or A/C system leakage in Volkswagen Vento?

Replacement of Schrader valves in LP/HP ports and preventive replacement of connecting O-rings with new (green) ones with a drop of PAG oil. If the machine shows no leaks under vacuum and the gas escapes after a month anyway, service valves (Schrader) are to blame in 50% of cases. They cost pennies, always replace them when servicing defects.

in Volkswagen Vento

Symptoms

Frost or ice on pipes under the hood
Slow loss of refrigerant

DTC error codes

Low pressure (below 2 bar)

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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

Standard

Refrigerant: R134a Amount (g): 825g Oil: - Oil (ml): - ml

See full specification

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Slow loss of refrigerant or A/C system leakage

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in Vento

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