What are the symptoms of Hissing from vents and slow loss of refrigerant in Honda Clarity?

No cold air from vents. Different temperature on both sides of the cabin. Air blows from incorrect vents

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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 Honda Clarity?

Detecting the loss with an electronic gas detector inserted into the condensate drain hose. The repair involves complete disassembly of the dashboard, steering column and center console in order to remove the heater module and replace the evaporator core with a new element. The work is extremely expensive and labor-intensive (it takes approximately 6-10 man-hours).

in Honda Clarity (2016-2022)

Symptoms

No cold air from vents
Different temperature on both sides of the cabin
Air blows from incorrect vents

DTC error codes

Low 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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