What are the symptoms of Blower vents emit warm air when A/C is turned on in Volvo C30?

No cold air from vents. Problem visible at standstill or in traffic. Problem appears while driving

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Blower vents emit warm air when A/C is turned on

Q: How to fix Blower vents emit warm air when A/C is turned on in Volvo C30?

Diagnostics of the fan's electrical system (checking the fuse and relay) and replacing the damaged radiator fan (Electric Fan) or its integrated control module with a new element.

in Volvo C30 (2004-2017)

Symptoms

No cold air from vents
Problem visible at standstill or in traffic
Problem appears while driving

DTC error codes

DTC B1423

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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

Standard

Refrigerant: R134a Amount (g): 535g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 200ml

See full specification

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Blower vents emit warm air when A/C is turned on

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in C30

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