Step | Action | Values | Yes | No | ||||||||||||
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Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The temperature cannot be adjusted, or heating is insufficient. | ||||||||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||||||||
2 | Place the blower motor switch in each speed position. Does the blower motor work in any speed position? | -- | Go to Step 3 | Go to Blower Motor Malfunction | ||||||||||||
3 | Does blower motor run in the desired speed position? | -- | Go to Step 4 | Go to Blower Motor Malfunction | ||||||||||||
4 |
Does the rear boil coolant pump work? | -- | Go to Step 5 | Go to Rear Boil Coolant Pump Operation | ||||||||||||
5 |
Does the recirculation door move from the recirculation position to the outside air position? | -- | Go to Step 6 | |||||||||||||
6 | Place the passenger temperature switch in the OFF position. Does the too cold in vehicle condition occur when heating or defrosting is desired? | -- | Go to Step 7 | Go to Step 9 | ||||||||||||
7 |
Does the A/C compressor operate? | -- | Go to Step 8 | |||||||||||||
8 | Inspect the cooling system for the following conditions:
Refer to Heating Performance Diagnostic . Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 9 | ||||||||||||
9 |
Does the paper stay in place? | -- | Go to Step 10 | Go to Step 16 | ||||||||||||
10 |
Does the scan tool indicate the sensor temperatures is within 3°C (5°F) of the thermometer temperature? | -- | Go to Step 11 | Go to Step 14 | ||||||||||||
11 |
Is the Solar Sensor parameter greater than the specified value? | 220 Counts | Go to Step 12 | Go to Step 19 | ||||||||||||
12 |
Do the counts change? | -- | Go to Step 13 | Go to Step 19 | ||||||||||||
13 | Test the resistance of the ambient air temperature sensor. Refer to Sensor Resistance Table . Is the resistance near the value in the Sensor Resistance Table? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 15 | ||||||||||||
14 | Test the resistance of the inside air temperature sensor. Refer to Sensor Resistance Table . Is the resistance near the value in the Sensor Resistance Table? | -- | Go to Step 20 | Go to Step 18 | ||||||||||||
15 | Inspect for poor connections at the harness connector of the ambient air temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 17 | ||||||||||||
16 | Inspect the aspirator tube for a air leak or obstruction. Did you find and correct the condition? | -- | Go to Step 25 | -- | ||||||||||||
17 | Inspect for poor connections at the harness connector of the ambient air temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 23 | ||||||||||||
18 | 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 . Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 21 | ||||||||||||
19 | Inspect for poor connections at the harness connector of the sunload sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector 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 HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 24 | ||||||||||||
21 | Replace the inside air temperature sensor. Refer to Inside Air Temperature Sensor Replacement . Have you finished the replacement? | -- | Go to Step 25 | -- | ||||||||||||
22 | Replace the sunload sensor. Refer to Sun Load Sensor Replacement . Have you finished the replacement? | -- | Go to Step 25 | -- | ||||||||||||
23 | Replace the ambient air temperature sensor. Refer to Ambient Air Temperature Sensor Replacement . Have you finished the replacement? | -- | Go to Step 25 | -- | ||||||||||||
24 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Have you finished 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 |