For 1990-2009 cars

## Functional Check Buick

Set A/C Controls | Result
--- | ---
The following procedures test the manual air conditioning system. You may complete all of the steps in each procedure without using any tools. Complete this procedure under the following conditions:

• | The temperature outside of the vehicle is 16°C (60°F) or higher.

• | The engine is running.

In order to effectively diagnose a manual air conditioning system condition, use the diagnostic procedure outlined in this section. Perform each step in the order presented.

Engine running Set A/C control to OFF |

- The OFF LED illuminates.

Press NORM Temperature Selector: COOL Blower Control: HIGH |

• | The NORM LED illuminates.

• | Cool air flows from the instrument panel outlets.

• | The blower runs at high speed. The compressor turns ON.

Press MAX |

• | The MAX LED illuminates.

• | Cool air flows from the instrument panel outlets.

• | Blower noise changes.

• | The compressor continues to operate.

Press BI-LEV |

• | The BI-LEV LED illuminates.

• | Cool air flows from the panel outlets and from the floor outlets.

• | The compressor continues to operate.

Press RECIRC |

• | The RECIRC LED illuminates.

• | Cool air flows from the instrument panel outlets.

Press FRONT Temperature Selector: WARM |

• | The FRONT LED illuminates.

• | Warm air flows from the defroster outlets.

• | The compressor continues to operate.

Press VENT |

• | The VENT LED illuminates.

• | The compressor turns OFF.

• | Warm air flows from the instrument panel outlets.

Press HRT |

• | The HRT LED illuminates.

• | Warm air flows from the floor outlets.

Press BLEND |

• | The BLEND LED illuminates.

• | Warm air flows from the defroster outlets and from the floor outlets.

Press OFF |

- The blower turns OFF.

Press HRT |

- The blower returns to high speed.

Blower Control: Move from HIGH to LOW |

- The blower speed reduces each time you move the switch.

## Functional Check Oldsmobile

Set A/C Controls | Result
--- | ---
The following procedures test the manual air conditioning system. You may complete all of the steps in each procedure without using any tools. Complete this procedure under the following conditions:

• | With the temperature outside of the vehicle at 16°C (60°F) or higher

• | With the engine running

In order to effectively diagnose a manual air conditioning system condition, use the diagnostic procedure outlined in this section. Perform each step in the order presented.

Mode Selector: OFF Fan: LO |

- Blower is not running.

Mode Selector: LOWER Temperature Selector: FULL WARM |

• | The blower runs at low speed.

• | Warm air flows from the floor outlets.

Increase the Blower Speed from LO to HI |

- Increased air flow at each step.

Mode Selector: DEF |

• | Air flows from the defroster outlets.

• | The compressor turns ON.

• | The air becomes warm.

Mode Selector: UPPER |

• | Outside air flows from the A/C instrument panel.

• | The compressor is off.

Mode Selector: BI-LEV Temperature Selector: FULL COLD |

• | Cold air flows from the center instrument panel outlet and from the floor outlets.

• | The compressor turns ON.

Mode Selector: RECIRC |

• | Blower noise will increase when the outside air valve closes.

• | The compressor continues to operate.

Mode Selector: DEFOG |

• | Air flows from the defroster outlets and from the floor outlets.

• | The compressor continues to operate.

Mode Selector: OFF |

• | The blower turns OFF.

• | The compressor turns OFF.

## Functional Check Pontiac

Set A/C Controls | Result
--- | ---
The following procedures test the manual air conditioning system. You may complete all of the steps in each procedure without using any tools. Complete this procedure under the following conditions:

• | With the temperature outside of the vehicle at 16°C (60°F) or higher

• | With the engine running

In order to effectively diagnose a manual air conditioning system condition, use the diagnostic procedure outlined in this section. Perform each step in the order presented.

Mode Selector: OFF Fan: LO |

- The blower is not running.

Mode Selector: HEAT Temperature Selector: FULL WARM |

• | The blower runs at low speed.

• | Warm air flows from the floor outlets.

Increase the Blower Speed from LO to HI |

- Increased air flow at each step.

Mode Selector: DEF |

• | Air flows from the defroster outlets.

• | The compressor turns ON.

• | Air becomes warm.

Mode Selector: VENT |

• | Outside air flows from the A/C instrument panel.

• | The compressor is OFF.

Mode Selector: BI-LEV Temperature Selector: FULL COLD |

• | Cold air flows from the center instrument panel outlets and from the floor outlets.

• | The compressor turns ON.

Mode Selector: A/C |

• | Cold air flows from the center instrument panel outlets.

• | The compressor turns ON.

Mode Selector: MAX |

• | Blower noise will increase when the air inlet valve closes.

• | The compressor continues to run.

• | Air flows from the instrument panel outlets.

Mode Selector: DEFOG |

• | Air flows from the defroster outlet and from the floor outlets.

• | The compressor continues to run.

Mode Selector: OFF |

• | The blower turns OFF.

• | The compressor turns OFF.