What are the symptoms of Hissing from vents and slow loss of refrigerant in Inna SQ7?

No cold air from vents. Different temperature on both sides of the cabin. Unusual noises when A/C is turned on

High Priority 95% confidence

Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in Inna SQ7?

A complex repair process in which technicians (using an electronic trace gas leak detector injected into the system) diagnose a leak from around the expansion valve O-rings or the evaporator assembly housing itself. Repair requires precise documentation of the procedure for replacing defective seals and/or the entire valve module for the manufacturer.

in Inna SQ7

Symptoms

No cold air from vents
Different temperature on both sides of the cabin
Unusual noises when A/C is turned 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 Inna SQ7 or book a workshop visit.

Generate AI report Schedule visit