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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 Grandeur IG?

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 Grandeur IG

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

3,3 i/3,8 i/2,2 D CRDi

Refrigerant: R134a Amount (g): 480 – 520g Oil: PAG PAO 68 Oil (ml): 140 – 160ml

See full specification

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