High Priority 95% confidence

A/C cooling is weak and gradually loses performance

Q: How to fix A/C cooling is weak and gradually loses performance in Hyundai Kona?

Condenser replacement. NOTE: You need to extract it by VIN and year, it comes in 4 different, incompatible versions!

in Hyundai Kona (2018-2025)

Symptoms

Weak cabin cooling

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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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A/C cooling is weak and gradually loses performance

Symptoms

A/C Technical Specifications

Other problems in Kona

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