HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): No Heating at All; 2019 - 2025 MY RAV4 [11/2018

Last Modified: 05-08-2025	6.11:8.1.0	Doc ID: RM100000001FPEQ
Model Year Start: 2019	Model: RAV4	Prod Date Range: [11/2018 - ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): No Heating at All; 2019 - 2025 MY RAV4 [11/2018 - ]

No Heating at All

DESCRIPTION

If warm air is not discharged (airflow volume control is normal), the following malfunctions are possible.

Malfunction Status	Factor
No heating at all (airflow volume control is normal) Air outlet temperature does not increase (airflow volume control is normal)	Low engine coolant temperature Air mix damper and link operation (jamming) Warm-up control Heater core closed waterway

PROCEDURE

1.	READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / Engine / Data List.

(e) Read the Data List according to the display on the Techstream.

Powertrain > Engine

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Coolant Temperature	Engine coolant temperature	Min.: -40°C (-40°F), Max.: 140°C (284°F)	75 to 100°C (167 to 212°F): After warming up	This is the engine coolant temperature. HINT: After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F). After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal. If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted. Check if the engine overheats if the value indicated is higher than 135°C (275°F).

Powertrain > Engine > Data List

Tester Display
Coolant Temperature

OK:

The value of the display does not change frequently.

GO TO COOLING SYSTEM

2.	PERFORM ACTIVE TEST USING TECHSTREAM (SERVO PULSE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) for Automatic Air Conditioning System:

(1) Check the operation by referring to the table below.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 to 257 pulses

Air Mix Servo Targ Pulse(P)

No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

Min.: 128

Max.: 383

Operates between 255 to 347 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(P)

OK:

Damper servo motor is operated.

(f) for Manual Air Conditioning System:

(1) Check the operation by referring to the table below.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (air mix) pulse

Min.: 128

Max.: 383

Operates between 165 to 257 pulses

OK:

Damper servo motor is operated.

Body Electrical > Air Conditioner > Active Test

Tester Display
Air Mix Servo Targ Pulse(D)

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY

GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION)