Motorcraft RG640 Engine Coolant Thermostat O-Ring Seal

The Motorcraft RG640 is a genuine OEM engine coolant outlet O-ring seal designed specifically for Ford and Lincoln thermostat housings and water outlet assemblies. This precision-engineered seal ensures a reliable, leak-free connection in your vehicle's cooling system.

Key Features:

• Manufactured from premium quality materials for maximum sealing capability and cushioning performance in extreme temperatures
• Designed and tested to Ford's rigorous engineering standards for OE fit, durability, and performance
• Genuine Motorcraft part recommended by Ford Motor Company for Ford, Lincoln, and Mercury vehicles
• Cross-references to Ford OEM part number HL3Z8255A
• Backed by Motorcraft Service Parts Warranty offering 3 years of coverage with nationwide dealer support

This O-ring seal is essential when replacing your thermostat or repairing coolant outlet leaks. Motorcraft parts undergo rigorous laboratory and real-world testing to ensure proper fit and long-lasting performance, with any innovations developed since original vehicle manufacture included in these replacement parts.