What are the symptoms of Slow loss of refrigerant or A/C system leakage in Lexus IS 250?

No cold air from vents. Frost or ice on pipes under the hood

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Slow loss of refrigerant or A/C system leakage

Q: How to fix Slow loss of refrigerant or A/C system leakage in Lexus IS 250?

A categorical ban on including entire systems on invoices. Tests with live verification (live scan) to detect wiring short circuits by soldering, strengthening cable breaks and tightening with dense thermo-shrink at the pipe. After unscrewing (secured with a valve fan without escaping the huge amounts of gas on the side of the bumper) the emergency measuring pressure switch is replaced with a replacement costing a few dozen zlotys to revive the pressostatic circuit after resetting the circuit errors and securely fasten a clean copper plug cleaned from the garbage. The condenser has a built-in Schrader valve, which allows you to remove the pressure switch without losing freon from the system.

in Lexus IS 250 (2006-2013)

Symptoms

No cold air from vents
Frost or ice on pipes under the hood

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

d/5,0 F

Refrigerant: R134a Amount (g): 440g Oil: ND8 PAO 68 lub PAG ISO 46 b.d. LS Oil (ml): 40ml

300

Refrigerant: R134a Amount (g): 550 – 650g Oil: ND8 PAO 68 lub PAG ISO 46 b.d. IS Oil (ml): 250ml

200

Refrigerant: R134a Amount (g): 550 – 650g Oil: ND8 PAO 68 lub PAG ISO 46 Oil (ml): 150ml

See full specification

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Slow loss of refrigerant or A/C system leakage

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in IS 250

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