For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Functional Test performed? | -- | Go to Step 2 | Go to Function Test
2 |

1. Set the mode to VENT.
2. Set the temperature control to full COLD.
3. Set the blower speed to OFF.
4. There should be no airflow at the following outlets:

• | The vent

• | The heater

• | The defroster

• | The side window defroster

Is the airflow correct?

--

Go to Step 3

Go to Step 8

3 |

1. Set the blower speed to HI.
2. Inspect for airflow at the following outlets:

• | The vent

• | The heater

• | The defroster

• | The side window defroster

Does air flow through the vent outlets at ambient temperature and no air flow through the heater, defroster and side window defroster outlets?

--

Go to Step 4

Go to Step 8

4 |

1. Set the mode to HEAT.
2. Set the temperature control to full HOT.
3. Inspect for airflow at the following outlets:

• | The vent

• | The heater

• | The defroster

• | The side window defroster

4. Hot air should flow through the heater outlet with the blower at HI speed, while a minimum of hot air should flow through the defroster and the side window defroster outlets. Also, no airflow should exist at the vent outlets.

Is the airflow correct?

--

Go to Step 5

Go to Step 8

5 |

1. Set the mode to DEFROST.
2. Inspect for airflow at the following outlets:

• | The vent

• | The heater

• | The defroster

• | The side window defroster

3. Hot air should flow through the heater outlet with the blower at HI speed, while a minimum of hot air should flow through the defroster and the side window defroster outlets. Also, no airflow should exist at the vent outlets.

Is the airflow correct?

--

Go to Step 6

Go to Step 8

6 |

1. Disconnect the affected control cable(s) at the door(s)
2. Inspect the door travel and effort.

Are the door travel and effort correct?

--

Go to Step 7

Go to Step 9

7 | Test the control cable(s) travel by moving the corresponding control at the heater control unit. Is the control cable travel correct? | -- | Go to Step 10 | Go to Step 11
8 | Repair the affected control cable(s) as necessary. Refer to the following:

• | Temperature Control Cable Replacement

• | Mode Control Cable Replacement

• | Vent Control Cables Replacement

Is the action complete?

--

Go to Step 12

--

9 | Repair the affected door at the heater case as necessary. Is the action complete? | -- | Go to Step 12 | --
10 | Reinstall the control cable(s). Is the action complete? | -- | Go to Step 12 | --
11 | Inspect the control cable(s) attachment at the heater control unit. Repair any control cable attachment as necessary. Is the action complete? | -- | Go to Step 12 | --
12 | Perform the Function Test . Is the action complete? | -- | System OK | --