Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001HIRL
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [02/2019 - 08/2020]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Front Window Fogging; 2019 - 2020 MY RAV4 HV [02/2019 - 08/2020]

Front Window Fogging

DESCRIPTION

If the front glass frequently fogs up when the air conditioning system is operated, the following causes are possible.

Malfunction Status

Factor

Front glass frequently fogs
  • Compressor with motor assembly malfunction
  • Lack of refrigerant gas
  • Cooler expansion valve (opened too far)
  • Mode damper servo malfunction
  • Mode damper and link operation (jamming)

PROCEDURE

1.

CHECK REFRIGERANT SHORTAGE

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON (READY).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Body Electrical > Air Conditioner > Utility

Tester Display

Refrigerant Gas Volume Check

(e) Prepare the vehicle according to the table below.

Measurement Condition:

Item

Condition

Vehicle Condition

Ignition switch ON (READY)

Doors

Fully closed (windows also fully closed)

A/C Switch

On

Recirculation/fresh Control Switch

Recirculation

Set Temperature

MAX COLD

Blower Speed

HI

Air Conditioning Air Inlet Temperature

25 to 35°C (77 to 95°F)

HINT:

  • Refer to the Techstream operator's manual for further details.
  • A message indicating a refrigerant shortage is displayed on the Techstream and the air conditioning system turns off if the amount of refrigerant in the system is insufficient.
  • DTCs are not stored when performing the refrigerant shortage check using the Techstream.
  • *1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.
  • *2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.

Result

Amount of Refrigerant

Refrigerant shortage

Insufficient or leakage

Refrigerant correct

Correct

OK:

"Refrigerant correct" is displayed on the Techstream.

NG

CHARGE SYSTEM WITH REFRIGERANT

  • for HFC-134a (R134a): 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFC-134a(R134a)): REPLACEMENT
  • for HFO-1234yf (R1234yf): 2019 - 2024 MY RAV4 RAV4 HV [02/2019 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFO-1234yf(R1234yf)): REPLACEMENT

OK

2.

CHECK OPERATION

(a) When the MODE switch on the air conditioning control assembly is pushed, check that the air conditioning system changes DEF mode according to the switch operation.

OK:

Air conditioning system changes DEF mode.

OK

GO TO ON-VEHICLE INSPECTION (CHECK REFRIGERANT PRESSURE USING GAUGE)

NG

GO TO DTC B1443