Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Weak Blower Output

Toyota Corolla Cross (2022-2025) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Gasoline Model With Manual Air Conditioning System) / 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
  • ECO mode control of air conditioning system is enabled
  • 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.

NG

GO TO OTHER DIAGNOSIS PROCEDURE (Blower Motor Circuit)

OK

2.

CHECK CLEAN AIR FILTER

(a) Visually check the clean air filter.

Click here

OK:

The clean air filter is not dirty or clogged.

NG

REPLACE CLEAN AIR FILTER

OK

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.

NG

INSTALL NO. 1 COOLER THERMISTOR

OK

4.

CHECK ASPIRATOR

(a) Check the installation condition of the aspirator.

OK:

The aspirator is installed correctly.

OK

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

NG

INSTALL ASPIRATOR

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