Keystone NI3014103 Coolant Reservoir Overflow Tank with Cap

The Keystone NI3014103 is an OEM-replacement coolant reservoir, also known as a coolant overflow tank or expansion tank, designed for the 1991–1994 Nissan Sentra. This non-pressurized plastic bottle captures excess coolant as it expands from the radiator during engine warm-up and returns it to the cooling system as the engine cools, helping maintain proper fluid levels and prevent overheating.

Key Features:

• Direct, bolt-on replacement — no modifications required for installation
• Constructed of durable polypropylene plastic to withstand underhood heat and vibration
• Non-pressurized design matches original factory specifications
• Reservoir cap included
• No level sensor included
• OEM part number cross-reference: 2171069Y11 (also cross-references 21710-69Y00, 21710-0M000, 21710-62Y00)
• Partslink number: NI3014103

This coolant reservoir is packaged as a single unit with cap and is engineered to restore the cooling system's overflow and recovery function to factory performance. It is an ideal solution for vehicles with cracked, leaking, or damaged original reservoirs.