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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 Lexus GX 460?

It is strictly forbidden to replace the compressor or the A/C control computer itself. The gas is recovered, the old pressure switch is unscrewed and the correct replacement is installed. Verifying the power harness of the 3 sensor wires before replacing the element protects against misdiagnosis.

in Lexus GX 460 (2010-2023)

Symptoms

No cold air from vents

DTC error codes

B1423

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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

GX550 (Od , układ wielostrefowy)

Refrigerant: R1234yf Amount (g): 800g Oil: - Oil (ml): - ml

GX460 (, Tri-Zone)

Refrigerant: R134a Amount (g): 810g Oil: - Oil (ml): - ml

GX470

Refrigerant: R134a Amount (g): 623g Oil: - Oil (ml): - ml

See full specification

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