What are the symptoms of Hissing from vents and slow loss of refrigerant in Citroën C-ELYSEE (DD_)?

No cold air from vents. Strange smell in cabin when blower is on

Medium priority 88% confidence

Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in Citroën C-ELYSEE (DD_)?

Complete removal of the dashboard, center console, and steering column to extract and split open the HVAC unit. Replace the evaporator core with an upgraded aftermarket unit (Nissens, Denso) and ensure the condensate drain tube is fully cleared.

in Citroën C-ELYSEE (DD_) (2012-2024)

Symptoms

No cold air from vents
Strange smell in cabin when blower is on

Verifying license...

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

Have this problem?

Generate a personalized AI report for your Citroën C-ELYSEE (DD_) or book a workshop visit.

Generate AI report Schedule visit