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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 Kona Electric?

Extreme flushing of the heating main and replacing the blue fluid with a new one AND replacing the blocked EWP water pump (Recall 239). Be careful! This 'blue liquid' costs a fortune (approx. PLN 200/litre) and is absolutely critical for the battery and cabin heating. If it crystallizes, it blocks the heater in 5 seconds. Immediately send it to the ASO for the Recall 239 action.

in Hyundai Kona Electric (2021-2025)

Symptoms

Reduced range or EV heating issue

DTC error codes

EWP Block / HV Coolant 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

(OS)

Refrigerant: R1234yf Amount (g): 400-450g Oil: PAG YF ISO 46 Oil (ml): 100 - 130ml

OS (Wersje spalinowe)

Refrigerant: R1234yf Amount (g): 475g Oil: PAG ISO 46 YF Oil (ml): 120ml

See full specification

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