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Air conditioning stopped cooling / no response to AC button

Q: How to fix Air conditioning stopped cooling / no response to AC button in Hyundai Sonata DN8?

Dropping the board, complete disassembly of the heater stove. Bulkhead evaporator replacement. Korean abdominal pain with organic YF factor. A plague worth thousands of zlotys of labor.

in Hyundai Sonata DN8

Symptoms

Air conditioning stopped cooling / no response to AC button

DTC error codes

Brak

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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

V (NF)

Refrigerant: R134a Amount (g): 530 – 570g Oil: PAG FD46XG PAO 68 lub PAG ISO 46 Oil (ml): 150ml

IV (new EF)

Refrigerant: R134a Amount (g): 660 –700g Oil: PAG FD46XG PAO 68 lub PAG ISO 46 Oil (ml): 150ml

III (EF)

Refrigerant: R134a Amount (g): 675 –725g Oil: PAG FD46XG PAO 68 lub PAG ISO 46 Oil (ml): 150ml

See full specification

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