Step | Action | Values | Yes | No | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The temperature cannot be adjusted, or the heating is insufficient. | ||||||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||||
2 |
Does the blower motor operate in any of the speed positions? | -- | Go to Step 3 | Go to Blower Motor Inoperative | ||||||||||||
3 | Does the blower motor operate at the desired speeds? | -- | Go to Step 4 | Go to Blower Motor Malfunction | ||||||||||||
4 | Inspect the cooling system for the following conditions:
Refer to Heating Performance Diagnostic . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 5 | ||||||||||||
5 |
Does the recirculation door move to the recirculation position? | -- | Go to Step 6 | Go to Air Delivery Improper | ||||||||||||
6 | Place the mode switch in the VENT or HTR positions. Does the A/C compressor operate? | -- | Go to Step 7 | |||||||||||||
7 |
Does the air temperature actuator drive shaft rotate at all? | -- | Go to Step 8 | Go to Step 10 | ||||||||||||
8 | Inspect the air temperature door and the air temperature actuator for the following conditions:
Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 9 | ||||||||||||
9 | Test the air temperature actuator control A and control B circuits of the air temperature actuator for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 10 | ||||||||||||
10 |
Does the test lamp illuminate with each command? | -- | Go to Step 13 | Go to Step 11 | ||||||||||||
11 | Test the ignition 3 voltage circuit of the HVAC control module for an open, high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 12 | ||||||||||||
12 | Test the ground circuit of the HVAC control module for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 15 | ||||||||||||
13 | Inspect for poor connections at the harness connector of the air temperature actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 14 | ||||||||||||
14 | Inspect the air temperature actuator, door and any attaching linkage for binding or a condition that prevents drive shaft rotation. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 16 | ||||||||||||
15 | Inspect for poor 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 18 | Go to Step 17 | ||||||||||||
16 | Replace the air temperature actuator. Refer to Temperature Valve Actuator Replacement . Did you complete the replacement? | -- | Go to Step 18 | -- | ||||||||||||
17 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 18 | -- | ||||||||||||
18 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 | ||||||||||||
