Home› Belts and Cooling > Gaskets and Sealing Systems› Fel-Pro 35918 Engine Coolant Thermostat Case Seal
Fel-Pro 35918 Engine Coolant Thermostat Case SealOE Quality 60-Day Returns
Part #: 35918

Fel-Pro 35918 Engine Coolant Thermostat Case Seal

⚙️ 144 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$10.61Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Hyundai and Kia, Forte, Forte Koup, Forte5, Genesis Coupe, Magentis, Optima, Rondo, Santa Fe, Santa Fe Sport, Sonata, Sorento, Sportage, Stinger, Tucson, and Veloster N
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? Click here for all Engine Coolant Thermostat Case Seal options

Reliable Engine Coolant Thermostat Case Seal for Hyundai and Kia

The Fel-Pro 35918 engine coolant thermostat case seal is designed to provide a precise and durable seal for your vehicle's thermostat housing. Engineered to meet the specifications of various Hyundai and Kia models, this premium-grade seal ensures proper coolant containment and system efficiency.

  • Premium grade material for enhanced durability
  • Inside diameter: 25.0 mm for accurate fitment
  • Outside diameter: 31.5 mm ensuring proper sealing surface coverage
  • Thickness of 3.25 mm for reliable compression and sealing
  • Compatible with multiple Hyundai and Kia models including Forte, Sonata, and Tucson

Product Details and Specifications

The Fel-Pro 35918 thermostat case seal is manufactured to precise dimensions, with an inside diameter of 25.0 mm and an outside diameter of 31.5 mm. Its 3.25 mm thickness provides the necessary compression to maintain a leak-free seal under varying engine temperatures and pressures. This seal is designed without mounting holes, fitting securely within the thermostat housing to prevent coolant leaks. It is compatible with a range of Hyundai and Kia vehicles such as the Forte, Forte5, Forte Koup, Genesis Coupe, Magentis, Optima, Rondo, Santa Fe, Santa Fe Sport, Sonata, Sorento, Sportage, Stinger, Tucson, and Veloster N.

Common Applications and Problem Resolution

  • Prevents coolant leaks around the thermostat housing
  • Maintains proper engine temperature regulation by ensuring thermostat housing integrity
  • Eliminates coolant seepage that can cause engine overheating
  • Replaces worn or damaged seals to restore cooling system performance
  • Helps avoid engine damage related to coolant loss

Installation Notes and Tips

When installing the Fel-Pro 35918 thermostat case seal, ensure the thermostat housing and surrounding surfaces are clean and free of old gasket material or debris. Proper alignment of the seal is critical to prevent leaks. Avoid over-tightening the housing bolts to maintain the seal’s integrity and prevent deformation. It is recommended to inspect the thermostat and housing for wear or damage during replacement.

Quality Assurance and Warranty

Fel-Pro parts are engineered to meet or exceed OEM specifications, providing reliable sealing solutions for your vehicle’s cooling system. The 35918 thermostat case seal is manufactured with premium materials to ensure long-lasting performance. While specific warranty details are not provided, Fel-Pro products typically come with a limited warranty against defects in material and workmanship.

BrandFel-Pro
Part Number35918
Grade TypePremium
Inside Diameter25.0
Mounting Hole Quantity0
Outside Diameter31.5
Thickness3.25

This part fits 144 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2021HyundaiTucson2.4LL4N/A
2021HyundaiVeloster N2.0LL4N/A
2021KiaSportage2.4LL4N/A
2021KiaSportage2.0LL4N/A
2021KiaStinger2.0LL4N/A
2020HyundaiSanta Fe2.4LL4N/A
2020HyundaiSanta Fe2.0LL4N/A
2020HyundaiTucson2.4LL4N/A
2020HyundaiVeloster N2.0LL4N/A
2020KiaOptima2.4LL4N/A
2020KiaOptima2.0LL4N/A
2020KiaSorento2.4LL4N/A
2020KiaSportage2.4LL4N/A
2020KiaSportage2.0LL4N/A
2020KiaStinger2.0LL4N/A
2019HyundaiSanta Fe2.4LL4N/A
2019HyundaiSanta Fe2.0LL4N/A
2019HyundaiSonata2.4LL4N/A
2019HyundaiSonata2.0LL4N/A
2019HyundaiTucson2.4LL4N/A
2019HyundaiVeloster N2.0LL4N/A
2019KiaOptima2.4LL4N/A
2019KiaOptima2.0LL4N/A
2019KiaSorento2.4LL4N/A
2019KiaSportage2.4LL4N/A
2019KiaSportage2.0LL4N/A
2019KiaStinger2.0LL4N/A
2018HyundaiSanta Fe Sport2.4LL4N/A
2018HyundaiSanta Fe Sport2.0LL4N/A
2018HyundaiSonata2.4LL4N/A
2018HyundaiSonata2.0LL4N/A
2018HyundaiTucson2.4LL4N/A
2018KiaOptima2.4LL4N/A
2018KiaOptima2.0LL4N/A
2018KiaSorento2.4LL4N/A
2018KiaSorento2.0LL4N/A
2018KiaSportage2.4LL4N/A
2018KiaSportage2.0LL4N/A
2018KiaStinger2.0LL4N/A
2017HyundaiSanta Fe Sport2.4LL4N/A
2017HyundaiSanta Fe Sport2.0LL4N/A
2017HyundaiSonata2.4LL4N/A
2017HyundaiSonata2.0LL4N/A
2017KiaOptima2.4LL4N/A
2017KiaOptima2.0LL4N/A
2017KiaSorento2.4LL4N/A
2017KiaSorento2.0LL4N/A
2017KiaSportage2.4LL4N/A
2017KiaSportage2.0LL4N/A
2016HyundaiSanta Fe Sport2.4LL4N/A
2016HyundaiSanta Fe Sport2.0LL4N/A
2016HyundaiSonata2.4LL4N/A
2016HyundaiSonata2.0LL4N/A
2016KiaOptima2.4LL4N/A
2016KiaOptima2.0LL4N/A
2016KiaSorento2.4LL4N/A
2016KiaSorento2.0LL4N/A
2016KiaSportage2.4LL4N/A
2016KiaSportage2.0LL4N/A
2015HyundaiSanta Fe Sport2.4LL4N/A
2015HyundaiSanta Fe Sport2.0LL4N/A
2015HyundaiSonata2.4LL4N/A
2015HyundaiSonata2.0LL4N/A
2015HyundaiTucson2.4LL4N/A
2015KiaOptima2.4LL4N/A
2015KiaOptima2.0LL4N/A
2015KiaSorento2.4LL4N/A
2015KiaSportage2.4LL4N/A
2015KiaSportage2.0LL4N/A
2014HyundaiGenesis Coupe2.0LL4N/A
2014HyundaiSanta Fe Sport2.4LL4N/A
2014HyundaiSanta Fe Sport2.0LL4N/A
2014HyundaiSonata2.4LL4N/A
2014HyundaiSonata2.0LL4N/A
2014HyundaiTucson2.4LL4N/A
2014KiaOptima2.4LL4N/A
2014KiaOptima2.0LL4N/A
2014KiaSorento2.4LL4N/A
2014KiaSportage2.4LL4N/A
2014KiaSportage2.0LL4N/A
2013HyundaiGenesis Coupe2.0LL4N/A
2013HyundaiSanta Fe Sport2.4LL4N/A
2013HyundaiSanta Fe Sport2.0LL4N/A
2013HyundaiSonata2.4LL4N/A
2013HyundaiSonata2.0LL4N/A
2013HyundaiTucson2.4LL4N/A
2013HyundaiTucson2.0LL4N/A
2013KiaForte2.4LL4N/A
2013KiaForte2.0LL4N/A
2013KiaForte Koup2.4LL4N/A
2013KiaForte Koup2.0LL4N/A
2013KiaForte52.4LL4N/A
2013KiaForte52.0LL4N/A
2013KiaOptima2.4LL4N/A
2013KiaOptima2.0LL4N/A
2013KiaSorento2.4LL4N/A
2013KiaSportage2.4LL4N/A
2013KiaSportage2.0LL4N/A
2012HyundaiSanta Fe2.4LL4N/A
2012HyundaiSonata2.4LL4N/A
2012HyundaiSonata2.0LL4N/A
2012HyundaiTucson2.4LL4N/A
2012HyundaiTucson2.0LL4N/A
2012KiaForte2.4LL4N/A
2012KiaForte2.0LL4N/A
2012KiaForte Koup2.4LL4N/A
2012KiaForte Koup2.0LL4N/A
2012KiaForte52.4LL4N/A
2012KiaForte52.0LL4N/A
2012KiaOptima2.4LL4N/A
2012KiaOptima2.0LL4N/A
2012KiaRondo2.4LL4N/A
2012KiaSorento2.4LL4N/A
2012KiaSportage2.4LL4N/A
2012KiaSportage2.0LL4N/A
2011HyundaiSanta Fe2.4LL4N/A
2011HyundaiSonata2.4LL4N/A
2011HyundaiSonata2.0LL4N/A
2011HyundaiTucson2.4LL4N/A
2011HyundaiTucson2.0LL4N/A
2011KiaForte2.4LL4N/A
2011KiaForte2.0LL4N/A
2011KiaForte Koup2.4LL4N/A
2011KiaForte Koup2.0LL4N/A
2011KiaOptima2.4LL4N/A
2011KiaOptima2.0LL4N/A
2011KiaRondo2.4LL4N/A
2011KiaSorento2.4LL4N/A
2011KiaSportage2.4LL4N/A
2011KiaSportage2.0LL4N/A
2010HyundaiSanta Fe2.4LL4N/A
2010HyundaiSonata2.4LL4N/A
2010HyundaiTucson2.4LL4N/A
2010KiaForte2.4LL4N/A
2010KiaForte2.0LL4N/A
2010KiaForte Koup2.4LL4N/A
2010KiaForte Koup2.0LL4N/A
2010KiaMagentis2.4LL4N/A
2010KiaOptima2.4LL4N/A
2010KiaRondo2.4LL4N/A
2009HyundaiSonata2.4LL4N/A
2009KiaMagentis2.4LL4N/A
2009KiaOptima2.4LL4N/A
2009KiaRondo2.4LL4N/A

* 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:

256442G000C32422

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