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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 Transporter 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 Transporter 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

Refrigerant: R134a Amount (g): 600g Oil: z układem klimatyzacji z tyłu 900 kompresor: 7E0820803P/R PAG 46 PAO 68 lub PAG ISO 46 140 z układem klimatyzacji z tyłu PAG 46 PAO 68 lub PAG ISO 46 220 kompresor: 7E0820803N/Q PAG 46 PAO 68 lub PAG ISO 46 140 z układem klimatyzacji z tyłu PAG 46 PAO 68 lub PAG ISO 46 2501 Volkswagen kompresor: 7E0820803M PAG 46 PAO 68 lub PAG ISO 46 60 z układem klimatyzacji z tyłu PAG 46 PAO 68 lub PAG ISO 46 100 kompresor: 5Q0820803F PAG 46 PAO 68 lub PAG ISO 46 110 z układem klimatyzacji z tyłu PAG 46 PAO 68 lub PAG ISO 46 Oil (ml): 150ml

T6 (SG_) Przód

Refrigerant: R134a Amount (g): 600g Oil: PAG ISO 46 Oil (ml): b.d.ml

T6 (SG_) Przód + Tył

Refrigerant: R134a Amount (g): 900g Oil: PAG ISO 46 Oil (ml): b.d.ml

See full specification

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