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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 Kia Niro Hybrid?

Deactivation of the High Voltage system! Replacement of the compressor, extensive chemical flushing of the entire system, replacement of the condenser with dryer and TXV. Lack of precise rinsing will cause the car to immediately kill the new pump 5 minutes after installation due to circulating iron. Oil for HV - mandatory POE dielectric!

in Kia Niro Hybrid (2016-2022)

Symptoms

Air conditioning does not turn on

DTC error codes

High Voltage Isolation Error

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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

Standard

Refrigerant: R1234yf Amount (g): 550g Oil: POE PAO 68 AA1 Oil (ml): 130ml

See full specification

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