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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 All Models?

Frost or ice on pipes under the hood. Air conditioning does not turn on

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

Connecting the temperature sensor under the bumper AND hard reset (resetting power bus errors). Many painters send their cars to an air conditioner to "fill up the gas" because it stopped working after the bell. First, connect a small thermometer in the bumper grill and the air conditioning will come back to life.

in Hyundai All Models

Symptoms

Frost or ice on pipes under the hood
Air conditioning does not turn on

DTC error codes

Ambient Temp Sensor 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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