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Cabin blower does not work or works only on maximum speed

Q: What are the symptoms of Cabin blower does not work or works only on maximum speed in Volvo V90 Cross Country?

No cold air from vents. Blower works only on highest speed. Hissing from vents. Musty mold odor from vents

Q: How to fix Cabin blower does not work or works only on maximum speed in Volvo V90 Cross Country?

Replacing the damaged evaporator with a new, modified part (Mahle/Hella). The repair is extremely time-consuming and requires complete disassembly of the dashboard (approx. 12-15 man hours). To prevent recurrence of the fault, a preventive harness with a 1k-ohm resistor (Volvo part number: 32241228) is installed in the evaporator temperature sensor circuit, which corrects the CCM readings by turning off the compressor before the core freezes.

in Volvo V90 Cross Country (2016-2025)

Symptoms

No cold air from vents
Blower works only on highest speed
Hissing from vents
Musty mold odor from vents

DTC error codes

B10B915

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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

V90 - V40

Refrigerant: R134a Amount (g): 635g Oil: 161627 PAO 68 lub PAG ISO 46 b.d. Oil (ml): b.d.ml

V90 - V60

Refrigerant: R134a Amount (g): 820g Oil: PAG PAO 68 lub PAG ISO 46 b.d. Oil (ml): b.d.ml

V90 - V70 III (BW)

Refrigerant: R134a Amount (g): 820g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 180ml

See full specification

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