Test Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

4: The HVAC control module is inoperative when the module does not respond to an operator control request.
5: If the condition does not occur when an air conditioning (A/C) request has been made then you must bypass the A/C performance test procedures.
6: These actions are the enable criteria for the A/C compressor to operate. Ambient air temperature must be above 3°C (38°F) in order for this A/C compressor test to be run.
7: Performing the Air Conditioning System Performance Test ensures that the A/C system is operating properly for further testing.
9: If no condition found with all conditions listed then compare door travel to known good vehicle.
15: The voltage will vary between 0-5 volts during normal operation. Ensure to observe the air temperature actuator driveshaft and the volt meter when jumping the control circuit with 5-volt reference and the ground circuits. The air temperature actuator and the HVAC control module connectors must be connected during this step.

Too Hot in Vehicle

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 Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Turn ON the ignition, with the engine OFF. Place the blower motor switch in each speed position. Does the blower motor operate at all?	-	Go to Step 3	Go to Blower Motor Inoperative
3	Does the blower motor operate correctly for each speed position?	-	Go to Step 4	Go to Blower Motor Malfunction
4	Is the HVAC control module inoperative?	-	Go to Step 18	Go to Step 5
5	Does the Too Hot in Vehicle concern occur when air conditioning (A/C) cooling is desired?	-	Go to Step 6	Go to Step 8
6	IMPORTANT: For A/C compressor operation, the ambient air temperature must be above 3°C (38°F). Start the engine. Place the blower motor switch in the maximum speed position. Place the A/C request switch in the ON position. Place the air temperature switch in the coldest position. Does the A/C compressor operate?	-	Go to Step 7	Go to HVAC Compressor Clutch Does Not Engage (Non-Hybrid) or HVAC Compressor Clutch Does Not Engage (Hybrid)
7	Perform the refrigerant system performance test. Refer to Air Conditioning (A/C) System Performance Test (L61) or Air Conditioning (A/C) System Performance Test (L66 Red Line) or Air Conditioning (A/C) System Performance Test (L66 Base) or Air Conditioning (A/C) System Performance Test (LAT) . Did you find and correct the condition?	-	Go to Step 25	Go to Step 8
8	Observe the drive shaft of the air temperature actuator. Adjust the air temperature switch. Does the drive shaft of the air temperature actuator ever rotate?	-	Go to Step 9	Go to Step 10
9	Inspect the air temperature door and the air temperature actuator for the following conditions: A misaligned air temperature actuator-Refer to Air Temperature Actuator Replacement . Broken linkages or binding linkages A broken air temperature door or a binding air temperature door An obstruction that prevents the air temperature door from operating within the full range of motion Missing seals to the air temperature door Misaligned seals to the air temperature door Did you find and correct the condition?	-	Go to Step 25	Go to Testing for Intermittent Conditions and Poor Connections
10	Test the ignition 1 voltage circuit of the air temperature actuator for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 11
11	Test the ground circuit of the air temperature actuator for an open. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 12
12	Test the 5-volt reference circuit of the air temperature actuator for a high resistance. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 13
13	Test the signal circuit of the air temperature door actuator for an open or a high resistance. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 14
14	Test the door control circuit of the air temperature actuator an open or a high resistance. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 15
15	IMPORTANT: Ensure the air temperature actuator connector and the HVAC control module connectors are connected during this step to avoid misdiagnosis. Turn ON the ignition, with the engine OFF. Backprobe and monitor the voltage from the door signal circuit of the air temperature actuator to a good ground. Connect a 3-amp fused jumper between the door control circuit and the 5-volt reference circuit of the air temperature actuator. This action drives the actuator to the full COOL mode. Remove and reconnect the jumper wire between the air temperature door control and the ground circuit of the air temperature actuator. This action drives the actuator to the full HOT mode. Does the drive shaft of the air temperature actuator rotate and does the voltage change?	-	Go to Step 16	Go to Step 20
16	IMPORTANT: Ensure the air temperature actuator connector is connected during this step to avoid misdiagnosis. Backprobe the connector terminal of the air temperature actuator in order to measure the voltage from the door control circuit to ground. Adjust the air temperature switch. Is the voltage measurement near the specified value in each condition?	0 V increasing 5 V decreasing 2.5 V stationary	Go to Step 17	Go to Step 22
17	Inspect the air temperature door for a mechanical condition or for a condition that allows excessive travel of the door. Did you find and correct the condition?	-	Go to Step 25	-
18	Test the ignition 1 voltage circuit of the HVAC control module for the following: An open A high resistance A short to ground Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 19
19	Test the ground circuit of the HVAC control module for an open. Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 22
20	Inspect for poor connections at the harness connector of the air temperature actuator. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 21
21	Inspect the air temperature actuator, the door, and any attaching linkage for binding or for a condition that prevents drive shaft rotation. Did you find and correct the condition?	-	Go to Step 25	Go to Step 23
22	Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs . Did you find and correct the condition?	-	Go to Step 25	Go to Step 24
23	IMPORTANT: Perform the calibration procedure for the air temperature actuator. Replace the air temperature actuator. Refer to Air Temperature Actuator Replacement .Did you complete the replacement?	-	Go to Step 25	-
24	Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 25	-
25	Operate the system in order to verify the repair. Did you correct the condition?	-	System OK	Go to Step 2