High Priority 95% confidence

Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in SEAT Alhambra (7N)?

Locating the leak under the floor, cutting out and replacing damaged sections of aluminum pipes or installing a special, dedicated set of flexible refrigerant hoses resistant to galvanic corrosion.

in SEAT Alhambra (7N) (2010-2020)

Symptoms

No cold air from vents

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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

(711) kompresor Denso

Refrigerant: R134a Amount (g): 525g Oil: G 052 300 A2 PAO 68 lub PAG ISO 46 Oil (ml): 140ml

(711) kompresor Sanden/Zexel

Refrigerant: R134a Amount (g): 525g Oil: G 052 154 A2 PAO 68 lub PAG ISO 46 Oil (ml): 120ml

(710) kompresor Denso

Refrigerant: R134a Amount (g): 600g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 140ml

See full specification

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