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Air conditioning stopped cooling / no response to AC button

Q: What are the symptoms of Air conditioning stopped cooling / no response to AC button in Hyundai Multi?

Air conditioning does not turn on. Problem after collision or accident

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

Replacing the A/C clutch relay in the box under the hood. This is the most common cause of 'sudden' death of the air conditioning in Asian cars and Fords. Swap the air conditioning relay with the horn relay (they are often the same) for a quick test.

in Hyundai Multi (2006-2016)

Symptoms

Air conditioning does not turn on
Problem after collision or accident

DTC error codes

P0645 (A/C Clutch Control Circuit)

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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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