Standard Ignition FLS-16 Engine Coolant Level Sensor

Engine Coolant Level Sensor Overview

The Standard Ignition FLS-16 engine coolant level sensor is built for accurate coolant level monitoring in vehicles that rely on a 12-volt electrical system. It uses a female plug-in connector with a 2-blade male terminal layout for straightforward service replacement on supported applications.

Compatible With Buick Rainier, Chevrolet Trailblazer, GMC Envoy, Pontiac Grand Am, and other listed GM and Mitsubishi applications, the FLS-16 is a direct-fit coolant level sensor solution for common warning-light and level-signal concerns. Standard Ignition FLS-16 is also cross-referenced to OE-style part numbers for the same application.

Key Features

• Engine coolant level sensor for monitoring coolant reservoir or tank level
• 12-volt design for listed vehicle applications
• Female connector with plug-in connection style
• 2-terminal blade configuration for service replacement
• Copper alloy conductors for strong electrical conductivity and low resistive loss
• 100% tested for mechanical switching and electrical switching performance
• Built with robust materials for demanding repair environments

Detailed Application Information

This Standard Ignition coolant level sensor is intended for vehicles including 2003-2007 Chevrolet Trailblazer, 2004-2007 Buick Rainier, 2003-2006 GMC Envoy, 1997-2005 Chevrolet Malibu, 1992-2005 Pontiac Grand Am, and 1995-2005 Chevrolet Cavalier. It also covers additional listed applications such as Buick Skylark, Oldsmobile Alero, Chevrolet Corsica, and Mitsubishi Mighty Max. The FLS-16 supports accurate coolant level signaling where the original sensor has failed or become unreliable.

This part cross-references OE-style numbers such as 5S1450 and 71-3559 for the same application.

Common Problems This Sensor Can Address

• Coolant level warning light staying on after the reservoir is filled
• Intermittent or inaccurate coolant level readings
• Failed sensor electrical switching during inspection or diagnosis
• Corrosion or wear at the original coolant level sensor connection
• Replacement needs after coolant system service on supported GM and Mitsubishi vehicles

Installation Notes and Tips

Verify the connector style, terminal count, and vehicle application before installation. Inspect the coolant reservoir or tank for contamination, cracks, or residue that could affect sensor operation, and confirm the electrical connector is clean and fully seated. After installation, check the cooling system for proper coolant level indication and confirm the warning circuit responds correctly.

Quality Assurance

Standard Ignition builds this sensor with copper alloy conductors and tests each unit for mechanical and electrical switching performance to support consistent service results.