The numbers below refer to the step numbers on the diagnostic table.
Step | Action | Value | Yes | No | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: Air does not flow correctly from the air distribution outlets. | ||||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||
2 |
Is the blower motor OFF? | -- | Go to Step 3 | Go to Blower Motor Always On | ||||||||||
3 | Place the blower motor switch in each speed position. Does the blower motor operate in any speed position? | -- | Go to Step 4 | Go to Blower Motor Inoperative | ||||||||||
4 | Does the blower motor operate in each speed position? | -- | Go to Step 5 | Go to Blower Motor Malfunction | ||||||||||
5 | Are all of the HVAC control module controls except for the blower motor inoperative? | -- | Go to Step 14 | Go to Step 6 | ||||||||||
6 |
Does the recirculation door move from the recirculation to the outside air position? | -- | Go to Step 7 | |||||||||||
7 |
Does air flow sufficiently from the proper air distribution outlets for each selected mode position? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 8 | ||||||||||
8 | Inspect the air delivery system for the following conditions:
Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 9 | ||||||||||
9 | Inspect the mode door and the mode actuator for the following conditions:
Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 10 | ||||||||||
10 |
Does the test lamp illuminate? | -- | Go to Step 11 | Go to Step 20 | ||||||||||
11 | Test the ground circuit of the mode actuator for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 12 | ||||||||||
Does the voltage measure near the specified values for each mode position? | Vent: 0.2V, Bi-Level: 3.1V, Floor: 5.0V Mix-Blend: 8.9V, Defrost: 11.8V | Go to Step 18 | Go to Step 13 | |||||||||||
13 | Test the mode door control circuit of the mode actuator for an open, a high resistance, a short to ground, or a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | --- | Go to Step 23 | Go to Step 19 | ||||||||||
Test the ignition 3 voltage circuit of the HVAC control module for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 15 | |||||||||||
15 | Test the battery positive voltage circuit of the HVAC control module for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 16 | ||||||||||
16 | Test the ground circuit of the HVAC control module for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 17 | ||||||||||
17 | Test the off blower motor control circuit of the HVAC control module for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 19 | ||||||||||
18 | Inspect for bad connections at the harness connector of the mode actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 21 | ||||||||||
19 | Inspect for bad connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 22 | ||||||||||
20 | Repair the ignition 3 voltage circuit of the mode actuator. Refer to Wiring Repairs . Did you complete the repair? | -- | Go to Step 23 | -- | ||||||||||
21 | Replace the mode actuator. Refer to Mode Actuator Replacement . Did you complete the replacement? | -- | Go to Step 23 | -- | ||||||||||
22 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 23 | -- | ||||||||||
23 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 8 |