What are the symptoms of Blower vents emit warm air when A/C is turned on in Kia Optima?

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

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Blower vents emit warm air when A/C is turned on

Q: How to fix Blower vents emit warm air when A/C is turned on in Kia Optima?

ETS sensor replacement (Sorento: 97614 3K000FFF, Optima: 97614 3S000FFF). Revised sensors have a blue line drawn on the plug. An old highway trick: when replacing it, simply turn off the air conditioning and let the warm air flow for 5 minutes until the ice from the evaporator flows under the car. The air conditioning will come back to life for another half hour of driving.

in Kia Optima (2011-2014)

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

Evaporator Temp Sensor Range

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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

Hybrid

Refrigerant: R1234yf Amount (g): 550g Oil: POE PAO 68 AA1 Oil (ml): 130ml

Hybrid

Refrigerant: R1234yf Amount (g): 550g Oil: POE PAO 68 AA1 Oil (ml): 125ml

Standard

Refrigerant: R1234yf Amount (g): 470g Oil: ND12 PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 90ml

See full specification

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Blower vents emit warm air when A/C is turned on

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in Optima

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