Standard Ignition FLS-3 Engine Coolant Level Sensor

Engine Coolant Level Sensor for GM Trucks and Vans

Standard Ignition FLS-3 is an engine coolant level sensor built for direct service on a wide range of Chevrolet and GMC applications. It uses a screw-in attachment method, a male connector, and a bullet-style terminal to support reliable electrical switching in 12-volt systems.

For Chevrolet C1500, K2500, Blazer, and GMC Jimmy applications, this coolant level sensor is a practical replacement when the original unit no longer reports coolant level correctly. The FLS-3 is also cross-referenced to common service numbers such as 5S1460 and 71-3569 for the same application.

Key Features

• Engine coolant level sensor for cooling system monitoring
• Screw-in attachment method for service replacement
• Male connector with one connector interface
• Male bullet terminal design
• 12-volt electrical specification
• Built with copper alloy conductors for strong electrical conductivity
• 100% tested for mechanical and electrical switching performance

Detailed Product Overview

Standard Ignition FLS-3 is engineered for vehicles that rely on a threaded coolant level sensor mounted in the cooling system reservoir or tank. Its robust construction and tested switching performance help maintain accurate coolant level signaling in demanding daily service. This part number is used across many GM truck, van, and SUV platforms, including Chevrolet C10, K10, C1500, K1500, P30, Blazer, and GMC C2500, K3500, P3500, and Jimmy applications.

This part cross-references 5S1460 and 71-3569 for the same application.

Common Problems This Sensor Can Address

• Inoperative or intermittent low coolant warning
• False coolant level alerts from a worn sensor
• Electrical signal loss at the coolant level circuit
• Corrosion-related sensor switching issues
• Replacement needs on aging Chevrolet and GMC cooling systems

Installation Notes and Tips

Verify the connector style, screw-in mounting, and terminal configuration before installation. Confirm the vehicle uses a 12-volt system and match the sensor to the original coolant level switch location. On GM trucks and vans such as Chevrolet C1500, GMC K2500, and Chevrolet G30, inspect the reservoir or tank opening for thread condition and sealing surface wear before installing the new sensor.

Quality Assurance

Standard Ignition builds this sensor with durable materials and copper alloy conductors, then tests each unit for mechanical and electrical switching performance before release.