HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System): Weak Blower Output; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM100000001H96L
Model Year Start: 2020	Model: GR Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System): Weak Blower Output; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

Weak Blower Output

DESCRIPTION

If the airflow from the front registers is weak regardless of the blower speed setting displayed on the air conditioning control assembly, the following factors may be the cause.

Symptom	Factor
Airflow volume is constantly low Airflow volume sometimes becomes low	Blower motor with fan sub-assembly malfunction Clogged clean air filter Clogged No. 1 cooler evaporator sub-assembly or heater radiator unit sub-assembly fins No. 1 cooler thermistor malfunction Aspirator not connected properly

PROCEDURE

1.	CHECK AIR CONDITIONING SYSTEM

(a) Operate the blower switch with the following conditions met and check that the airflow volume changes.

Blower Speed	Condition
LO → HI	Temperature setting: MAX COLD Air outlet mode: FACE A/C switch: Off

OK:

Airflow volume increases.

GO TO OTHER DIAGNOSIS PROCEDURE (Blower Motor Circuit)

2.	CHECK CLEAN AIR FILTER

(a) Visually check the clean air filter.

Click here

OK:

The clean air filter is not dirty or clogged.

REPLACE CLEAN AIR FILTER

3.	CHECK NO. 1 COOLER THERMISTOR

(a) Check the installation condition of the No. 1 cooler thermistor.

OK:

The No. 1 cooler thermistor is installed correctly.

INSTALL NO. 1 COOLER THERMISTOR

4.	CHECK ASPIRATOR

(a) Check the installation condition of the aspirator.

OK:

The aspirator is installed correctly.

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY OR NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY

INSTALL ASPIRATOR