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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 Multivan T5?

Instead of installing expensive and susceptible to re-corrosion original aluminum tubes, a highly effective and cheaper modification is to replace the aluminum lines with flexible, reinforced rubber hoses resistant to weather conditions and salt (e.g. Goodyear Galaxy).

in Volkswagen Multivan T5 (2003-2015)

Symptoms

No cold air from vents

DTC error codes

Low refrigerant pressure

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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

kompresor Denso

Refrigerant: R134a Amount (g): 750 – 800g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 175ml

kompresor Sanden

Refrigerant: R134a Amount (g): 750 – 800g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 135ml

California - T7 (układy dwuparownikowe)

Refrigerant: R1234yf Amount (g): 830g Oil: PAG ISO 46 YF Oil (ml): b.d.ml

See full specification

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