Step | Action | Value(s) | 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 |
Important:: The RDO-BATT fuse must be removed for 20 seconds minimum. The HVAC control module requires 60 seconds to initialize after the HVAC fuse is reinstalled. Do not install a scan tool during this time.
Does the scan tool display DTC B0408, B0415 or B0416? | -- | Go to Step 3 | |
3 | Place the blower motor switch in each speed position. Does the blower motor operate in each speed position? | -- | Go to Step 4 | Go to Blower Motor Inoperative |
4 | Does the blower motor provide sufficient air flow? | -- | Go to Step 5 | Go to Blower Motor Malfunction |
5 |
Does the Recirculation Door operate properly? | -- | Go to Step 6 | Go to Air Delivery Improper |
6 | Does the Too Hot in Vehicle concern occur when A/C cooling is desired? | -- | Go to Step 7 | Go to Step 9 |
7 |
Important:: Ambient air temperature must be above 3°C (38°F).
Is the A/C compressor ON? | -- | Go to Step 8 | |
8 | Perform the refrigerant system performance test. Refer to Air Conditioning (A/C) System Performance Test in Heating, Ventilation and Air Conditioning. Are the low and high side pressure values within the allowable limits for the recorded ambient air temperature, and within 103 kPa (15 psi) of each other? | -- | Go to Step 9 | Go to Leak Testing in Heating, Ventilation and Air Conditioning |
9 | Check the upper discharge, lower air temperature, and inside air temperature sensors for proper installation. Refer to Upper Discharge Air Temperature Sensor Replacement , Air Temperature Sensor Replacement - Lower , Inside Air Temperature Sensor Replacement . Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 10 |
10 |
Does the paper stay in place? | -- | Go to Step 11 | Go to Step 15 |
11 |
Do the temperatures vary by more than the specified range? | -3 to +3°C (-5 to +5°F) | Go to Step 12 | Go to Step 14 |
12 |
Does the scan tool indicate that the solar sensor parameter is greater than the specified value? | 230 counts | Go to Step 13 | Go to Step 16 |
13 |
Do the counts change? | -- | System OK | Go to Step 16 |
14 | Test the suspect temperature sensor resistance. Refer to Sensor Resistance Table . Does the resistance measure near the Sensor Resistance Table? | -- | Go to Step 17 | Go to Step 15 |
15 | Inspect for poor connections at the harness connector of the suspect air temperature sensor. 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 21 | Go to Step 18 |
16 | Inspect for poor connections at the harness connector of the sunload sensor. 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 21 | Go to Step 19 |
17 | 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 21 | Go to Step 20 |
18 | Replace the temperature sensor. Refer to Inside Air Temperature Sensor Replacement , Upper Discharge Air Temperature Sensor Replacement or Air Temperature Sensor Replacement - Lower . Did you complete the replacement? | -- | Go to Step 21 | -- |
19 | Replace the sunload sensor. Refer to Sun Load Sensor Replacement . Did you complete the replacement? | -- | Go to Step 21 | -- |
20 |
Important: Perform the recalibration procedure for the HVAC control module. Replace the HVAC control module. Refer to HVAC Control Module Replacement . Did you complete the replacement? | -- | Go to Step 21 | -- |
21 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
