For 1990-2009 cars

Step | Action | Normal Results | Abnormal Results*
--- | --- | --- | ---
1 |

1. Start the engine.
2. Move the blower speed selector switch to the following positions in the following order:

2.1. | LOW

2.2. | MEDIUM 1

2.3. | MEDIUM 2

2.4. | HIGH

2.5. | OFF

The blower motor speed increases at each speed level when you turn the blower speed selector switch towards the HIGH position.

• | Blower Motor Operates at High Speed Only

• | Blower Motor High Speed Inoperative

• | Blower Motor Inoperative Med-2

• | Blower Motor Inoperative Med-1

• | Blower Motor Low Speed Inoperative

• | Blower Motor Inoperative at Any Speed

• | Blower Motor Always On

2 |

• | Run the engine at idle until the operating temperature is reached.

• | Move the blower speed selector switch to any position except OFF.

• | Move the mode control to the VENT position.

• | Move the temperature control to the coldest position.

• | The blower motor operates at the selected speed.

• | Ambient air enters the passenger compartment through the instrument panel outlets.

• | Defrosting Insufficient

• | Heating Insufficient

• | Heat Excessive (Vent Mode)

• | Heat Excessive (Heat Mode)

• | High or Low Temperature Control Effort

• | Air Delivery Improper

3 |

• | Move the blower speed selector switch to any position except OFF.

• | Move the mode control to the HEAT position.

• | Move the temperature control to the hottest position.

• | The blower motor operates at the selected speed.

• | Heated air enters the passenger compartment.

• | Most of the heated air comes through the floor outlets. Some air comes through the windshield outlets and through the side window outlets.

• | Defrosting Insufficient

• | Heating Insufficient

• | Heat Excessive (Vent Mode)

• | Heat Excessive (Heat Mode)

• | High or Low Temperature Control Effort

• | Air Delivery Improper

4 |

• | Move the blower speed selector switch to any position except OFF.

• | Move the mode control to the DEFROST position.

• | Move the temperature control to the hottest position.

• | The blower motor operates at the selected speed.

• | Heated air enters the passenger compartment.

• | Most of the heated air goes to the windshield. Some air goes through the side window outlets and through the floor outlets.

• | Defrosting Insufficient

• | Heating Insufficient

• | Heat Excessive (Vent Mode)

• | Heat Excessive (Heat Mode)

• | High or Low Temperature Control Effort

• | Air Delivery Improper

5 |

1. Move the blower speed selector switch to any position except the OFF position.
2. Move the temperature control to the coldest position.
3. Press the air conditioning (A/C) switch to the ON position.

• | The blower motor operates at the selected speed.

• | The A/C compressor clutch engages.

• | The A/C condenser fan motor operates.

• | Cold air enters the passenger compartment.

• | The A/C compressor control module may cycle the A/C compressor clutch and the A/C condenser fan motor ON and OFF.

• | TXV A/C System Diagnosis (Insufficient Cooling)

• | TXV A/C System Diagnosis (Reference Table)

• | HVAC Compressor Clutch Does Not Engage

• | Condenser Fan Inoperative

• | Odor Diagnosis

6 | Turn the A/C switch to the OFF position. |

• | The A/C compressor clutch disengages.

• | The fan motor of the A/C condenser stops operating.

• | Condenser Fan Always On

• | HVAC Compressor Clutch Does Not Disengage

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.