Dayco E040318 Serpentine Belt - Air Conditioning
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Dayco
 Superseded by 4PK828EE - Available until depleted

Dayco E040318 Serpentine Belt - Air Conditioning

Brand Dayco E040318
Position Air Conditioning
Material Epdm4
Top Width .54
Color Black
Effective Length 0
Outside Circumference 0
Rib Quantity 4
Cross Section K-section
Free Length 31.8
Free Length 807.720
Maximum Operating Temperature 100
Maximum Operating Temperature 212
Minimum Operating Temperature -42.7
Minimum Operating Temperature -45
Rib Depth Standard
Rib Profile Straight rib
Standards Sae j1459
Product line Superseded by 4PK828EE - Available until depleted
Fits Subaru · 27 vehicles

EPDM4 construction. Helps resist heat and wear for dependable belt performance.

4-rib design. Delivers steady accessory drive engagement with a straight rib profile.

SAE J1459 compliant. Built to meet a recognized industry standard for belt quality.

Cross-references ACDelco 4K317SF, CARQUEST K040317SF and Gates K040317SF for the same application. See all 7.

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Dayco E040318 Serpentine Belt for Subaru A/C

Dayco E040318 is a black EPDM4 serpentine belt for the accessory drive belt system, built for Subaru air conditioning applications. It is an elastic self-tensioning belt used on select Subaru WRX STI, WRX, Impreza, Forester, and Outback models, with fitment that spans 2008-2021 depending on vehicle and configuration.

Key Features

  • EPDM4 construction for durable belt performance
  • 4-rib, K-section profile with straight rib design
  • Black finish with a .54 in top width
  • Free length: 31.8 in / 807.720 mm
  • Built to SAE J1459 standards
  • Operating temperature range: -45°F to 212°F
  • Subaru air conditioning belt application

Product Details

This Dayco serpentine belt is specified for Subaru air conditioning drive use and is listed for 2021 Subaru WRX STI, 2013-2020 Subaru WRX STI, 2008-2014 Subaru Impreza, 2013-2014 Subaru WRX, 2009-2013 Subaru Forester, 2009-2011 Subaru Outback, and 2008 Subaru Outback. The Dayco E040318 part number is associated with an elastic self-tensioning belt design, so correct application and proper installation procedure matter for belt alignment and tension control. This part cross-references Gates K040317SF and Subaru 11718-AA082 for the same application.

What It Helps Address

  • Squealing or slipping accessory drive belt noise
  • Cracked, glazed, or worn A/C belt surfaces
  • Loss of proper drive to the air conditioning compressor
  • Belt fitment issues on Subaru elastic self-tensioning applications
  • Service replacement for aging Subaru WRX STI, WRX, Impreza, Forester, and Outback belts

Installation Notes and Tips

Installation tool 93878 is required for the listed Subaru elastic self-tensioning applications. Verify the vehicle year, model, and A/C belt routing before installation, and confirm the belt matches the specified 4-rib K-section profile and 31.8-inch free length. For Subaru WRX STI, WRX, Impreza, Forester, and Outback fitments, follow the service procedure for elastic belts to avoid damage during installation.

Quality Assurance

Dayco manufactures this belt to SAE J1459 standards and uses EPDM4 material for temperature resistance and belt durability across a wide operating range. The product line note indicates this part is superseded by 4PK828EE and is available until depleted. Part number E040318 remains the reference for this listing.

Related reading

This part fits 27 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2021SubaruWRX STI——Air ConditioningInstallation Tool Required., Dayco Part 93878; Superseded by 4PK828EE - Available until depleted
2020SubaruWRX STI——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2019SubaruWRX STI——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2018SubaruWRX STI——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2017SubaruWRX STI——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2016SubaruWRX STI——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2015SubaruWRX STI——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2014SubaruImpreza2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2014SubaruWRX——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2014SubaruWRX STI——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2013SubaruForester2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2013SubaruImpreza2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2013SubaruWRX——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2013SubaruWRX STI——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2012SubaruForester2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2012SubaruImpreza2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2011SubaruForester2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2011SubaruImpreza2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2011SubaruOutback2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2010SubaruForester——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2010SubaruImpreza2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2010SubaruOutback2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2009SubaruForester——Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2009SubaruImpreza2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2009SubaruOutback2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2008SubaruImpreza2.5LH4Air ConditioningElastic self-tensioning serpentine belt requiring installation tool, part 93878; Superseded by 4PK828EE - Available until depleted
2008SubaruOutback2.5LH4Air ConditioningElastic Self-Tensioning Serpentine Belt; Installation Tool Required, Submodel: Impreza; Superseded by 4PK828EE - Available until depleted
Directly replaces or cross-references 7 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
ACDelco — 4K317SFCARQUEST — K040317SFGates — K040317SFGoodyear — 4040317SNAPA — 25-040317SFSubaru — 11718-AA082Subaru — 23979-AA000