What are the symptoms of Hissing from vents and slow loss of refrigerant in Skoda Octavia II?

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

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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 Skoda Octavia II?

Suctioning the remaining refrigerant from the system, unscrewing the old valve using a special wrench and installing brand new Schrader needle valves (for low and high pressure lines) before refilling the system with gas.

in Skoda Octavia II (2004-2015)

Symptoms

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

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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

IV - (NX)

Refrigerant: R1234yf Amount (g): 430-480g Oil: PAG YF ISO 46 Oil (ml): 120 - 140ml

III - (5E)

Refrigerant: R134a Amount (g): 450-500g Oil: PAG 46 Oil (ml): 120 - 140ml

III (5E3/5E5) kompresor Denso + Delphi

Refrigerant: R134a Amount (g): 490g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 110ml

See full specification

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