Step | Action | Values | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: HVAC Schematics Definition: The temperature cannot be adjusted, or the cooling is insufficient during A/C operation. | ||||||||||||||
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 speed? | -- | Go to Step 4 | Go to Blower Motor Malfunction | ||||||||||
4 | Does the A/C is ON, does the customer concern occur? | -- | Go to Step 5 | Go to Step 7 | ||||||||||
5 |
IMPORTANT:: Ambient air temperature must be above 5°C (41°F).
Does the A/C compressor operate? | -- | Go to Step 6 | |||||||||||
6 | Perform the refrigerant system performance test. Refer to Air Conditioning (A/C) System Performance Test . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 7 | ||||||||||
7 |
Does the drive shaft of the air temperature actuator rotate? | -- | Go to Step 8 | Go to Step 9 | ||||||||||
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 Testing for Intermittent Conditions and Poor Connections in Wiring Systems | ||||||||||
9 | Test the ignition 3 voltage circuit of the 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 | Test the low reference circuit of the air temperature actuator for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 11 | ||||||||||
11 | Test the control circuit of the air temperature actuator for an open, high resistance, short to ground, or short to voltage. 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 |
Important: Ensure that the HVAC control module connector is connected during this step in order to avoid misdiagnosis.
Does the voltage measure within the specified values with a smooth transition between cold and hot? | 0 V at cold 12 V at hot | Go to Step 13 | 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 in Wiring Systems. 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17 | ||||||||||
16 | Replace the air temperature actuator. Refer to Air Temperature Actuator Replacement . Did you complete the replacement? | -- | Go to Step 18 | -- | ||||||||||
17 | Replace the HVAC control module. Refer to HVAC Control Module 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 | ||||||||||
