Step | Action | Values | Yes | No | ||||||||||||
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Schematic Reference: HVAC Schematics DEFINITION: Temperature can not be adjusted or heating insufficient. | ||||||||||||||||
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | |||||||||||||
2 |
Important:: The RADIO fuse must be removed for 20 seconds minimum. The HVAC control module requires 60 seconds to initialize after the Radio fuse is reinstalled. Do not install a scan tool during this time.
Does the scan tool display DTC B0229, B0414, B0434, B3761 or B3764? | -- | Go to Step 3 | |||||||||||||
3 | Place the blower motor switch in each speed position. Does the blower motor operate in any of the speed positions? | -- | Go to Step 4 | Go to Blower Motor Inoperative | ||||||||||||
4 | Does the blower motor operate at the desired speed in each speed position? | -- | Go to Step 5 | Go to Blower Motor Malfunction | ||||||||||||
5 | Does the Too Cold in Vehicle concern occur when heating or defrosting is desired? | -- | Go to Step 6 | Go to Step 8 | ||||||||||||
6 |
Does the A/C compressor operate? | -- | Go to Step 7 | |||||||||||||
7 | Inspect the heating and cooling system for the following:
Did you find and correct the condition? | -- | Go to Step 24 | Go to Step 8 | ||||||||||||
8 | Inspect the air temperature sensors for the following conditions:
Refer to Air Temperature Sensor Replacement - Upper and Air Temperature Sensor Replacement - Lower . Did you find and correct the condition? | -- | Go to Step 24 | Go to Step 9 | ||||||||||||
9 |
Does the paper stay in place? | -- | Go to Step 10 | Go to Step 13 | ||||||||||||
10 |
Does the scan tool indicate that the Solar Sensor data parameter is greater than the specified value? | 230 Counts | Go to Step 11 | Go to Step 18 | ||||||||||||
11 |
Do the counts change? | -- | Go to Step 12 | Go to Step 18 | ||||||||||||
12 |
Does the scan tool indicate the sensor temperatures are within 3°C (5°F) of the thermometer temperatures? | -- | System OK | Go to Step 15 | ||||||||||||
13 | Test the ignition 1 voltage circuit of the inside air temperature sensor 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 24 | Go to Step 14 | ||||||||||||
14 | Test the ground circuit of the inside air temperature sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 24 | Go to Step 17 | ||||||||||||
15 | Inspect for poor connections at the harness connector of the suspect 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 24 | Go to Step 16 | ||||||||||||
16 | Test the suspect temperature sensor resistance. Refer to the Sensor Resistance Table . Does the resistance measure near the Sensor Resistance Table value? | -- | Go to Step 19 | Go to Step 20 | ||||||||||||
17 | Inspect for poor connections at the harness connector of the inside 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 24 | Go to Step 21 | ||||||||||||
18 | 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 24 | Go to Step 22 | ||||||||||||
19 | 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 24 | Go to Step 23 | ||||||||||||
20 | Replace the temperature sensor. Refer to Air Temperature Sensor Replacement - Upper or Air Temperature Sensor Replacement - Lower or Inside Air Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 24 | -- | ||||||||||||
21 | Replace the inside air temperature sensor. Refer to Inside Air Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 24 | -- | ||||||||||||
22 | Replace the sunload sensor. Refer to Sun Load Sensor Replacement . Did you complete the replacement? | -- | Go to Step 24 | -- | ||||||||||||
23 |
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 24 | -- | ||||||||||||
24 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |