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 HVAC Diagnostic System Check? | -- | 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 in Heating, Ventilation and Air Conditioning. 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 left and right 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 suspect air temperature actuator for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. 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 in Wiring Systems. 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 in Wiring Systems. 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 suspect air temperature actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 14 | ||||||||||||
14 | Inspect the suspect 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17 | ||||||||||||
16 | Replace the suspect air temperature actuator. Refer to Air Temperature Actuator Replacement - Right Side or Air Temperature Actuator Replacement - Left Side . Did you complete the replacement? | -- | Go to Step 18 | -- | ||||||||||||
17 | Replace the HVAC control module. Refer to Heater and Air Conditioning Control Replacement . 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 | ||||||||||||
