What are the symptoms of Hissing from vents and slow loss of refrigerant in Hyundai Santa Fe II?

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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Hissing from vents and slow loss of refrigerant

Q: How to fix Hissing from vents and slow loss of refrigerant in Hyundai Santa Fe II?

Adding R134a gas. Look for small leaks in the condenser/hoses. When it's freezing cold on the right and burning hot on the left in Hyundai (and Toyotas). ALL the internet experts are screaming: 'Blend Door flap motor $200, take off the board!!!' You just connect the HP LP hoses to the pressure gauge. In the system, instead of 600 grams, there are 120 grams. You will 'fill up' with the holiday and liven up the driver's area by cutting the diagnosis in half.

in Hyundai Santa Fe II (2006-2012)

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

None (mechanics' false readings)

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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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Hissing from vents and slow loss of refrigerant

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in Santa Fe II

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