What are the symptoms of A/C cooling is weak and gradually loses performance in Kia Forte?

No cold air from vents. Different temperature on both sides of the cabin. Weak or no heating in winter. No blowing from vents

High Priority 100% confidence

A/C cooling is weak and gradually loses performance

Q: How to fix A/C cooling is weak and gradually loses performance in Kia Forte?

Cutting the plug 25mm above the connector and soldering a new plug with thicker pins from the repair kit (18790 09298FFF). Typical plug-in pathology. Kicking the board from underneath sometimes brings the fan to life - this is 100% confirmation of the diagnosis. We cut and solder TSB CLI-053.

in Kia Forte (2019-2023)

Symptoms

No cold air from vents
Different temperature on both sides of the cabin
Weak or no heating in winter
No blowing from vents

DTC error codes

Brak

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 Kia Forte or book a workshop visit.

Generate AI report Schedule visit