Keystone FO1288166 Coolant Reservoir and Washer Combo with Cap, Motor & Sensor

The Keystone FO1288166 is an OEM-replacement combination coolant and windshield washer reservoir designed for the 1998–2001 Mercury Mountaineer. This direct-fit unit replaces the original factory reservoir assembly, restoring proper coolant overflow capacity and washer fluid storage in a single integrated unit.

This reservoir combo ships as a complete assembly, eliminating the need to source individual components separately. It is a high-quality aftermarket replacement that meets OEM fit and function standards, making it ideal for collision repair and routine maintenance applications.

Key Features:

• Combination unit — integrates coolant overflow reservoir and windshield washer fluid reservoir in one assembly
• Includes cap — coolant reservoir cap included for a complete, ready-to-install solution
• Includes washer motor — windshield washer pump motor included, no separate purchase necessary
• Includes sensor — fluid level sensor included for proper low-fluid warning functionality
• OEM-style replacement — direct fit to factory mounting locations with no modifications required
• Cross-references OEM part number F77Z-17618A — confirmed replacement for original Ford/Mercury factory part

Designed as a drop-in solution for collision repair professionals and DIY mechanics, the Keystone FO1288166 restores full cooling system overflow and windshield washer system function to factory specifications.