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Air conditioning stopped cooling / no response to AC button

Q: What are the symptoms of Air conditioning stopped cooling / no response to AC button in Nissan Pathfinder (R53)?

No cold air from vents. A/C does not react to control panel settings

Q: How to fix Air conditioning stopped cooling / no response to AC button in Nissan Pathfinder (R53)?

Connecting the factory Nissan CONSULT diagnostic interface and performing the software update procedure (reprogramming) of the IPDM E/R module to the latest version. In rare cases, if the controller freezes, it is necessary to physically replace the IPDM module (#284B7-*****).

in Nissan Pathfinder (R53) (2021-2022)

Symptoms

No cold air from vents
A/C does not react to control panel settings

DTC error codes

DTC B20C8-14

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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

(R51) 4,0 i/2,5 D dCi

Refrigerant: R134a Amount (g): 700g Oil: KLHOO-PAGSO PAO 68 lub PAG ISO 46 Oil (ml): 180ml

See full specification

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