Test Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number in the diagnostic table.

8. This step ensures that the lower air temperature sensors operate properly. The LH and RH Heater Duct Actual parameter count values should lower as the air temperature of the ducts get warmer. If there is a high resistance in either of the air temperature sensors circuits or the sensor itself then the count value of the effected sensor would remain high.
9. This step ensures that the upper air temperature sensors operate properly. The LH and RH AC Duct Actual parameter count values should lower as the air temperature of the ducts get warmer.
If there is a high resistance in either of the air temperature sensors circuits or the sensor itself then the count value of the effected sensor would remain high.
11. This action ensures that the internal fan of the inside air temperature sensor assembly is providing air flow across the internal sensor.
15. Use the following table to determine that the recorded scan tool values are within range for the recorded probe temperatures.

Fig 1: Description Test Too Cold In Vehicle Reference Data
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Fig 2: Diagnosis Procedure Too Cold In Vehicle (Step 1 To 4)
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Fig 3: Diagnosis Procedure Too Cold In Vehicle (Step 5 To 11)
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Fig 4: Diagnosis Procedure Too Cold In Vehicle (Step 12 To 15)
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Fig 5: Diagnosis Procedure Too Cold In Vehicle (Step 16 To 23)
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Fig 6: Diagnosis Procedure Too Cold In Vehicle (Step 24 To 28)
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