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Asymmetric cooling (driver/passenger different temperature)

Q: What are the symptoms of Asymmetric cooling (driver/passenger different temperature) in Toyota 4Runner?

Different temperature on both sides of the cabin. Musty mold odor from vents. Water dripping into cabin or wet carpets. Fogging windows

Q: How to fix Asymmetric cooling (driver/passenger different temperature) in Toyota 4Runner?

Carrying out detailed computer diagnostics of the HVAC system, checking the operating pressures (low and high) at the A/C service station and verifying any refrigerant losses using a UV dye or a gas detector. Depending on the detected anomalies, the repair involves replacing the damaged element (fan, sensor or cables) and refilling the system.

in Toyota 4Runner (2006-2019)

Symptoms

Different temperature on both sides of the cabin
Musty mold odor from vents
Water dripping into cabin or wet carpets
Fogging windows

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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

kierownica po lewej stronie

Refrigerant: R134a Amount (g): 700 – 800g Oil: ND8 PAO 68 lub PAG ISO 46 b.d. Auris Oil (ml): 200 – 12ml

kierownica po prawej stronie

Refrigerant: R134a Amount (g): 650 –750g Oil: ND8 PAO 68 lub PAG ISO 46 b.d. Oil (ml): b.d.ml

kierownica po lewej stronie

Refrigerant: R134a Amount (g): 450g Oil: ND8 PAO 68 lub PAG ISO 46 Oil (ml): 90ml

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Asymmetric cooling (driver/passenger different temperature)

Symptoms

A/C Technical Specifications

Other problems in 4Runner

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