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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 Toyota Highlander Hybrid?

Problem appears while driving. Frost or ice on pipes under the hood. Slow loss of refrigerant

Q: How to fix Air conditioning stopped cooling / no response to AC button in Toyota Highlander Hybrid?

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 Highlander Hybrid (2020-2020)

Symptoms

Problem appears while driving
Frost or ice on pipes under the hood
Slow loss of refrigerant

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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

Standard

Refrigerant: R134a Amount (g): 820g Oil: ND8 PAO 68 AA1 lub PAG ISO 46 b.d. Ipsum Oil (ml): 1996 – 01ml

Standard

Refrigerant: R134a Amount (g): 750g Oil: ND8 PAO 68 AA1 lub PAG ISO 46 b.d. Oil (ml): b.d.ml

See full specification

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