What are the symptoms of Hissing from vents and slow loss of refrigerant in Nissan Dayz?

No cold air from vents. Strange smell in cabin when blower is on. A/C does not react to control panel settings

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Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in Nissan Dayz?

Verification with an electronic gas detector at the grilles or condensate hose. The repair involves complete disassembly of the dashboard (in-panel), removal of the old casing and replacement of the leaking evaporator with a new core along with a new TXV expansion valve and gaskets. Due to the massive defect, Nissan extended the warranty on the evaporator in these models from 3 to 9 years.

in Nissan Dayz (2013-2020)

Symptoms

No cold air from vents
Strange smell in cabin when blower is on
A/C does not react to control panel settings

DTC error codes

Low refrigerant pressure

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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

Refrigerant specifications for this model are available in the catalog.

Open refrigerant database

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