High Priority 95% confidence

Air conditioning stopped cooling / no response to AC button

Q: How to fix Air conditioning stopped cooling / no response to AC button in Hyundai Tucson (ICE / Hybrid)?

Physical 'Network Reset'. In hybrid models, the yellow '12V BATT RESET' button on the board is used for this purpose (restarts the BMS). Alternatively, disconnect the battery terminals for 10 minutes. You have a brand new Tucson and the air conditioning is silent on vacation? The magic '12V BATT RESET' button (on the left side of the steering wheel in hybrids) resets the systems. In combustion cars, simply disconnect the battery terminal. As in IT: 'Have you tried turning it off and on again?' - it works great here.

in Hyundai Tucson (ICE / Hybrid) (2022-2025)

Symptoms

Air conditioning does not turn on

DTC error codes

CAN Network Comm 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

IV - (NX4)

Refrigerant: R1234yf Amount (g): 480-530g Oil: PAG YF ISO 46 Oil (ml): 120 - 150ml

(TLE)

Refrigerant: R1234yf Amount (g): 600g Oil: FD46XG PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 100ml

III - (TLE)

Refrigerant: R134a Amount (g): 500-550g Oil: PAG 46 Oil (ml): 130 - 160ml

See full specification

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