How to replace the air hose outlet duct on Cadillac STS?

Start by taking out the front engine compartment sight shield to replace the air cleaner outlet duct. You must disconnect the vacuum hose from the air cleaner duct followed by releasing the air duct clamps at both the supercharger inlet duct assembly and the air cleaner housing cover. Drain the air cleaner duct from the motor vehicle. Position and tighten both clamps on the supercharger inlet duct and air cleaner housing cover to 3 N.m (27 lb in) after installing the new air cleaner duct. Attache the vacuum hose to the air cleaner duct before reinstalling the front engine compartment sight shield.

OEM Cadillac STS Air Hose

Air Inlet Duct

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Cadillac STS Outlet Duct Part Number: 21999771
Product Specifications
- Other Name: Duct, Air Cleaner And Silencer
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2009 Cadillac STS | V | 8 Cyl 4.4 L GAS
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Cadillac STS Intake Duct Part Number: 15833712
Product Specifications
- Other Name: Duct, Air Cleaner Intake; Outlet Duct; Duct, Air Cleaner And Silencer
- Position: Rear
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2010 Cadillac STS | Base, Platinum | 8 Cyl 4.6 L GAS
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Cadillac STS Intake Duct Part Number: 25744215
Product Specifications
- Other Name: Duct, Air Cleaner Intake; Inlet Duct
- Position: Rear
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2006 Cadillac STS | Base | 8 Cyl 4.6 L GAS
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Cadillac STS Intake Duct Part Number: 25733251
Product Specifications
- Other Name: Duct, Air Cleaner Intake; Inlet Duct
- Position: Rear
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2008 Cadillac STS | Base, Platinum | 6 Cyl 3.6 L GAS
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Cadillac STS PCV Valve Part Number: 12614861
Product Specifications
- Other Name: Tube Assembly-PCV; Tube, Engine Crankcase Ventilation
- Replaces: 12604755
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2010 Cadillac STS | Base, Platinum | 8 Cyl 4.6 L GAS
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Cadillac STS Intake Duct Part Number: 15812947
$10.77 MSRP: $16.04
You Save: $5.27 (33%)
Product Specifications
- Other Name: Duct, Air Cleaner Intake; Inlet Duct; Duct, Air Cleaner And Silencer
- Position: Rear
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2011 Cadillac STS | Base, Platinum | 6 Cyl 3.6 L GAS

Cadillac STS Air Hose

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Cadillac STS Air Hose Parts and Q&A

Outlet Duct
21999771
Q: How to replace the air hose outlet duct on Cadillac STS?
A:
Start by taking out the front engine compartment sight shield to replace the air cleaner outlet duct. You must disconnect the vacuum hose from the air cleaner duct followed by releasing the air duct clamps at both the supercharger inlet duct assembly and the air cleaner housing cover. Drain the air cleaner duct from the motor vehicle. Position and tighten both clamps on the supercharger inlet duct and air cleaner housing cover to 3 N.m (27 lb in) after installing the new air cleaner duct. Attache the vacuum hose to the air cleaner duct before reinstalling the front engine compartment sight shield.