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No airflow from specific vents or clicking noise behind dashboard

Q: How to fix No airflow from specific vents or clicking noise behind dashboard in Nissan Altima?

Reading the serial number of the A/C Amplifier module (parts ending with '1C', '3C', '4C', '1A'). The repair involves updating the software (firmware) of the air conditioning amplifier using CONSULT-III plus while maintaining strict battery voltage stabilization (12.0 V - 15.5 V), and in the event of the controller blocking - replacing the module with a new hardware revision (no. 27760-*****).

in Nissan Altima (2019-2023)

Symptoms

Different temperature on both sides of the cabin

DTC error codes

Asymmetry temp logic fault

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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

(L33)

Refrigerant: R134a Amount (g): 560g Oil: - Oil (ml): - ml

See full specification

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