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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 92 (Heating / Air Conditioning System (HV) - Diagnostic Codes (3 Of 3), Circuit Tests & Symptom Tests) >> AIR CONDITIONING SYSTEM (for HV Model) >> Front Window Fogging [10/2022 - 11/2023] >> Description

Front Window Fogging [10/2022 - 11/2023]: Description

WARNING: This page is about a different variant/trim than selected.

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

Symptom Factor
Windshield frequently fogs up
  • Compressor with motor assembly malfunction
  • Refrigerant volume (low)
  • Cooler expansion valve (opened excessively)
  • No. 1 air conditioning radiator damper servo sub-assembly malfunction
  • Mechanical locking of damper and damper link
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