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Air conditioning stopped cooling / no response to AC button

Q: What are the symptoms of Air conditioning stopped cooling / no response to AC button in Hyundai Santa Fe?

Irregular A/C operation. No blowing from vents

Q: How to fix Air conditioning stopped cooling / no response to AC button in Hyundai Santa Fe?

You can go broke by buying a new box board from the dealer (Fuse Box Assembly) OR soldering a thick bypass cable coming from the "+" bus through an external Maxival 40A connector to revive the blower and save the car from burning the connector. A masterpiece of the Korean current chord of 35A on plastic connectors as thick as a hair. Make a good copper BY-PASS and insulate it thickly. It works better than parts costing PLN 1,000 from the dealership.

in Hyundai Santa Fe (2020-2021)

Symptoms

Irregular A/C operation
No blowing from vents

DTC error codes

Brak zasilania (Blower motor power open)

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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

IV - (TM)

Refrigerant: R1234yf Amount (g): 550-600g Oil: PAG YF ISO 46 Oil (ml): 140 - 170ml

(DM)

Refrigerant: R1234yf Amount (g): 600g Oil: FD46XG PAO 68 AA1 lub PAG ISO 46 YF Oil (ml): 120ml

(DM)

Refrigerant: R134a Amount (g): 600g Oil: FD46XG PAO 68 lub PAG ISO 46 Oil (ml): 120ml

See full specification

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Air conditioning stopped cooling / no response to AC button

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in Santa Fe

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