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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 Audi 3.0 TFSI 2013)?

Replacing a blown 40A belt fuse (Radiator AC Strip Fuse) for approx. USD 10/PLN 40 + replacing the pressure sensor with a dedicated OEM one. It immediately restored cooling. If replacing G395 does not help: ALWAYS check the radiator fan fuse. A blown 40A fuse (costs pennies) disguises itself as an air conditioning failure worth thousands of zlotys.

in Audi 3.0 TFSI 2013) (2011-2018)

Symptoms

No cold air from vents

DTC error codes

00256

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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

Refrigerant specifications for this model are available in the catalog.

Open refrigerant database

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