High Priority 98% confidence

Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in Volvo V90?

Inspection of the drainage hose arrangement, sealing and replacement of factory drainage hoses with modified components (including Volvo part numbers: 31455693, 31455694, 31390488). If flooding occurs, it is necessary to remove the carpet, thoroughly dry the floor and diagnose and clean/repair any corroded contacts in the module and SRS harness.

in Volvo V90 (2016-2017)

Symptoms

Fogging windows

DTC error codes

DTC SRS-B1000

Verifying license...

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 specifications for this model are available in the catalog.

Open refrigerant database

Have this problem?

Generate a personalized AI report for your Volvo V90 or book a workshop visit.

Generate AI report Schedule visit

Hissing from vents and slow loss of refrigerant

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in V90

Have this problem?