PLUG EXPANSION (Hyundai HN3975796)

A damaged expansion plug can allow coolant or oil to leak from core passages. During inspection, an expansion plug may show signs of corrosion or pitting that compromise its seal. Keeping an expansion plug in sound condition helps prevent sudden fluid loss and overheating. The plug is an aftermarket replacement part, cross-referenced to Hyundai part number HN3975796. Its general function is to seal openings in castings or blocks against pressure and debris. A common failure consequence is a slow drip that escalates into a major leak under operating temperature. Verify the serial number or application, then call (562) 693-7748.

Part number variants: HN3975796, hn3975796