AC help-04 Yukon
- Thread starter Quiky One
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gunslinger
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- Nov 21, 2005
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You'll need a scan tool to communicate with the HVAC module. It stores codes just like any other computer.
You've most likely got a blend door actuator, or a bad cabin temp sensor. (there could be several in the vehicle)
You've most likely got a blend door actuator, or a bad cabin temp sensor. (there could be several in the vehicle)
I have a feeling it is the blend door actuator. This happened this winter with the heat as well (not on auto so it makes me think it is NOT a temp sensor. This car has two of those though) and thats what makes me think it is a blend door. How much do those cost? Idea on extent of repair?
Also, would the HVAC module throw a code and not show it somewhere?
Ws6Stealthbird
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You could pinch off your heater hose lines till you get it fixed.
gunslinger
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Bulletin No.: 06-01-38-003
Date: April 27, 2006
TECHNICAL
Subject:
Intermittent Ticking Noise from I/P, Poor A/C Performance, HVAC DTCs B0229, B0414, B0424, B3770 (Reprogram HVAC Control Module)
Models:
2004-2006 Cadillac Escalade Models
2004-2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2004-2006 GMC Sierra Models, Yukon Models
with Air Conditioning (RPOs CJ2, CJ3)
Condition
Some customers may comment on one or more of the following concerns:
^ Intermittent ticking/clicking noise from the instrument panel.
^ Recirculation mode does not work or Air Conditioning (A/C) system performance is poor during high ambient temperatures.
^ Unable to control the driver side temperature.
^ Unable to control the passenger side temperature.
^ Unable to change the front system modes.
Cause
This condition may be caused by the Heating, Ventilation and Air Conditioning (HVAC) actuators that may hunt for the correct commanded position. This cycling may cause a clicking or ticking noise.
An overtravel of the HVAC system control doors may cause one or more of the concerns listed above. If an overtravel occurs, a Diagnostic Trouble Code (DTC) will be set, and the door will go to a preset default position. When a system door defaults, that door will stay at the default position until the DTC is cleared. After the DTC is cleared, the door will operate properly until the overtravel condition re-occurs.
The table lists the HVAC system doors and the DTC associated with it.
Correction
Technicians are to perform the normal diagnostic procedures in SI for these concerns. If diagnostics show that the HVAC system door(s) travel below 5 counts (out of the lower range) or above 250 counts (out of the upper range), then update the software calibrations in the HVAC control module. The new calibrations were made available to dealerships as part of TIS2000 incremental satellite update version 2.5, which was broadcast to dealers in February 2006.
The new calibrations have been updated to compensate for the actuator overtravel condition, the actuator hunting and the ticking/clicking noises. The new calibrations effectively eliminate the codes listed above, the default position of the doors associated with the DTCs and opens up the feedback position value. The new calibrations should not be used unless the vehicle has one or more of the customer concerns listed above or a DTC listed above has been set. The new calibrations will not correct any other DTC or NC system performance concern.
The temp door actuator is about $265, and it takes anywhere fron 1-3.5 hrs to replace depending on weather it's a left or right....does your truck have dual zones??
Once the actuator is replaced, the HVAC module will have to relearn its endpoints. IIRC, I think that this is done by disconnecting the battery for 30 seconds, reconnect, and run the temp control max hot to max cold.
Good luck.
Date: April 27, 2006
TECHNICAL
Subject:
Intermittent Ticking Noise from I/P, Poor A/C Performance, HVAC DTCs B0229, B0414, B0424, B3770 (Reprogram HVAC Control Module)
Models:
2004-2006 Cadillac Escalade Models
2004-2006 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2004-2006 GMC Sierra Models, Yukon Models
with Air Conditioning (RPOs CJ2, CJ3)
Condition
Some customers may comment on one or more of the following concerns:
^ Intermittent ticking/clicking noise from the instrument panel.
^ Recirculation mode does not work or Air Conditioning (A/C) system performance is poor during high ambient temperatures.
^ Unable to control the driver side temperature.
^ Unable to control the passenger side temperature.
^ Unable to change the front system modes.
Cause
This condition may be caused by the Heating, Ventilation and Air Conditioning (HVAC) actuators that may hunt for the correct commanded position. This cycling may cause a clicking or ticking noise.
An overtravel of the HVAC system control doors may cause one or more of the concerns listed above. If an overtravel occurs, a Diagnostic Trouble Code (DTC) will be set, and the door will go to a preset default position. When a system door defaults, that door will stay at the default position until the DTC is cleared. After the DTC is cleared, the door will operate properly until the overtravel condition re-occurs.
The table lists the HVAC system doors and the DTC associated with it.
Correction
Technicians are to perform the normal diagnostic procedures in SI for these concerns. If diagnostics show that the HVAC system door(s) travel below 5 counts (out of the lower range) or above 250 counts (out of the upper range), then update the software calibrations in the HVAC control module. The new calibrations were made available to dealerships as part of TIS2000 incremental satellite update version 2.5, which was broadcast to dealers in February 2006.
The new calibrations have been updated to compensate for the actuator overtravel condition, the actuator hunting and the ticking/clicking noises. The new calibrations effectively eliminate the codes listed above, the default position of the doors associated with the DTCs and opens up the feedback position value. The new calibrations should not be used unless the vehicle has one or more of the customer concerns listed above or a DTC listed above has been set. The new calibrations will not correct any other DTC or NC system performance concern.
The temp door actuator is about $265, and it takes anywhere fron 1-3.5 hrs to replace depending on weather it's a left or right....does your truck have dual zones??
Once the actuator is replaced, the HVAC module will have to relearn its endpoints. IIRC, I think that this is done by disconnecting the battery for 30 seconds, reconnect, and run the temp control max hot to max cold.
Good luck.
