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Sunsong 3402603 Power Steering Pressure Line Hose Assembly - Pump To Hydroboost (Hydroboost End)OE Quality 60-Day Returns
Part #: 3402603

Sunsong 3402603 Power Steering Pressure Line Hose Assembly - Pump To Hydroboost (Hydroboost End)

Pump To Hydroboost (Hydroboost End)
17 vehicles fit this part
Select your vehicle to confirm fitment
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Fitment: Cadillac, DeVille, DTS, and Seville
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Sunsong 3402603 Power Steering Pressure Line Hose

Sunsong 3402603 is a power steering pressure line hose assembly for select Cadillac applications with pump to hydroboost routing. It is built to meet demanding pressure requirements and is engineered for direct-fit replacement on Cadillac DTS, DeVille, and Seville models listed below.

Key Features

  • Pressure hose assembly for the power steering system
  • Max working pressure: 1,500 psi
  • Burst pressure rating: 8,700 psi
  • Tensile strength: 1,600 lb
  • 16 mm female O-ring end and 18 mm male O-ring end
  • 33.5 in. (850 mm) length
  • High-grade steel tubing with zinc electroplating for corrosion resistance
  • Precision-engineered for exact fit on the specified Cadillac applications

Detailed Description

This Sunsong power steering pressure line hose assembly is built for the pump to hydroboost connection and is engineered to restore proper hydraulic flow in the steering system. Part number 3402603 uses durable CSM hose material and corrosion-resistant steel tubing to handle heat, moisture, road salt, grime, and everyday underhood exposure. The hose is designed to match the original routing and connection style for a clean replacement on Cadillac DTS, DeVille, and Seville models.

This part cross-references Four Seasons 55188 for the same application.

Vehicle Fitment

  • Fits 2006-2011 Cadillac DTS, Pump To Hydroboost (Hydroboost End)
  • Fits 2000-2005 Cadillac DeVille, Pump To Hydroboost (Hydroboost End)
  • Fits 2000-2004 Cadillac Seville, Pump To Hydroboost (Hydroboost End)

What It Helps Solve

  • Power steering fluid leaks at the pressure line
  • Loss of steering assist from a damaged hose
  • Noise or vibration caused by restricted hydraulic flow
  • Corrosion-related hose deterioration
  • Improper fitment from a worn or incorrect replacement line

Installation Notes and Tips

Verify the end fittings before installation: 16 mm female O-ring on one end and 18 mm male O-ring on the other. Confirm the pump to hydroboost routing and compare the original hose length of 33.5 in. before removal. Inspect mating surfaces, seals, and adjacent steering components for wear or contamination so the new hose can seat correctly and maintain system pressure.

Quality Assurance

Each hose is pressure tested before it leaves the factory to help ensure proper operation after installation. Sunsong 3402603 is manufactured to exceed original equipment performance standards for pressure, burst strength, and durability.

BrandSunsong
Part Number3402603
Bracket (Y/N)N
End 1 Fitting Size (mm)16
End 1 Fitting TypeFemale o-ring
End 2 Fitting Size (mm)18
End 2 Fitting TypeMale o-ring
Hose Material 1Csm
Length (in)33.5
Length (mm)850
PS Switch Port (Y/N)N
Tech TipTt1000

This part fits 17 vehicles. Search below:

YearMakeModelSubmodelPositionNotes
2011CadillacDTSPump To Hydroboost (Hydroboost End)
2010CadillacDTSPump To Hydroboost (Hydroboost End)
2009CadillacDTSPump To Hydroboost (Hydroboost End)
2008CadillacDTSPump To Hydroboost (Hydroboost End)
2007CadillacDTSPump To Hydroboost (Hydroboost End)
2006CadillacDTSBasePump To Hydroboost (Hydroboost End)
2005CadillacDeVillePump To Hydroboost (Hydroboost End)
2004CadillacDeVillePump To Hydroboost (Hydroboost End)
2004CadillacSevilleSLSPump To Hydroboost (Hydroboost End)
2003CadillacDeVillePump To Hydroboost (Hydroboost End)
2003CadillacSevillePump To Hydroboost (Hydroboost End)
2002CadillacDeVillePump To Hydroboost (Hydroboost End)
2002CadillacSevillePump To Hydroboost (Hydroboost End)
2001CadillacDeVillePump To Hydroboost (Hydroboost End)
2001CadillacSevillePump To Hydroboost (Hydroboost End)
2000CadillacDeVillePump To Hydroboost (Hydroboost End)
2000CadillacSevillePump To Hydroboost (Hydroboost End)

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

260760533656595518892269

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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