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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 85 (Heating / Air Conditioning System - Diagnostic Codes (3 Of 3), Circuit Tests & Symptom Tests) >> AIR CONDITIONING SYSTEM (for PHEV Model) >> Front Window Fogging [08/2023 - ] >> Description

Front Window Fogging [08/2023 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.

If the windshield frequently fogs up even though the air conditioning system is operating, the following factors may be the cause.

Malfunction Status Factor
Windshield frequently fogs up
  • Compressor
  • Refrigerant volume
  • Servo motor
  • Damper and damper link
  • Evaporator temp. sensor (No. 1 cooler thermistor)
  • Air conditioning pressure sensor
  • Cooling electric expansion valve (cooler expansion valve)
  • Heating electric expansion valve (No. 2 cooler expansion valve)
  • Low pressure magnetic valve (No. 1 magnet valve assembly)
  • Evaporator front magnetic valve (No. 2 magnet valve assembly)
  • High pressure magnetic valve (No. 3 magnet valve assembly)
  • Pressure regulator sub-assembly
  • Ambient temp. sensor (thermistor assembly)
  • Water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly)
  • External condenser refrigerant temperature sensor (thermostat assembly)
  • No. 4 air conditioning thermistor assembly

    Evaporator refrigerant temperature sensor (No. 4 air conditioning thermistor assembly)

  • Heat pump ECU assembly
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