Fel-Pro 25538 Engine Coolant Thermostat Housing Gasket - Upper

Fel-Pro 25538 Thermostat Housing Gasket

Fel-Pro 25538 is an engine coolant thermostat housing gasket built for upper thermostat housing sealing on select Hyundai and Kia applications. It uses application-specific materials to help maintain a tight coolant seal where the thermostat housing meets the engine.

• Engine coolant thermostat housing gasket for upper housing locations
• Inside diameter: 1.950 in. / 49.5 mm
• Thickness: 1.3 mm for a precise sealing surface
• Mounting hole quantity: 2
• Premium grade construction
• Fits 1996-2012 Hyundai Elantra, Upper
• Fits 2010-2011 Kia Soul, Upper
• Fits 2005-2010 Kia Sportage, Upper
• Fits 2005-2009 Hyundai Tucson, Upper
• Fits 2004-2009 Kia Spectra, Upper
• Fits 2005-2009 Kia Spectra5, Upper
• Fits 2003-2008 Hyundai Tiburon, Upper
• Fits 1997-2001 Hyundai Tiburon, Upper

This Fel-Pro thermostat housing gasket is made for drivers and technicians replacing a leaking upper coolant seal on Hyundai Elantra, Hyundai Tucson, Kia Sportage, Kia Spectra, Kia Spectra5, Kia Soul, and Hyundai Tiburon models. Part number 25538 is engineered to match the housing interface and help restore proper coolant containment at the thermostat housing.

Common Uses

• Stops coolant seepage at the upper thermostat housing
• Replaces a flattened, hardened, or damaged gasket surface
• Addresses coolant odor or visible residue around the housing
• Helps correct seepage after thermostat service
• Supports repair of overheating caused by coolant loss

Installation Notes

Clean both mating surfaces before installation and remove all old gasket material, corrosion, and coolant residue. Verify the housing and flange are flat and follow the vehicle service procedure for torque sequence and coolant refill. Confirm upper-position fitment before ordering; this part number 25538 is listed for upper thermostat housing applications only.

Quality Assurance

Fel-Pro gaskets are built around vehicle-specific sealing materials and application-focused design to deliver consistent sealing performance. This part cross-references MAHLE C31999 for the same application.