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The air conditioning does not cool and irregular operation of air conditioning

Q: What are the symptoms of The air conditioning does not cool and irregular operation of air conditioning in Hyundai i40?

Irregular A/C operation. A/C does not react to control panel settings

Q: How to fix The air conditioning does not cool and irregular operation of air conditioning in Hyundai i40?

Removal of the front panel (AC Control Unit) and its physical replacement with new CAN node coding. If you change the third temperature sensor and the system still reports that it is short-circuited, remove the control panel. The chip on the board burned the CAN input path.

in Hyundai i40 (2016-2016)

Symptoms

Irregular A/C operation
A/C does not react to control panel settings

DTC error codes

Evaporator Temp Sensor (Ghost)

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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

1,6 GDi/2,0 GDi/1,7 CRDi

Refrigerant: R134a Amount (g): 550g Oil: PAG PAO 68 lub PAG ISO 46 Oil (ml): 120ml

See full specification

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