Engine Coolant Temperature Sender Overview

Standard Ignition TS-166 is an engine coolant temperature sender built for dashboard indicator-light applications. It uses a bolt-on design with a round, plug-in female connector and a single male blade terminal for straightforward electrical connection.

Key Features

• Bolt-on mounting with 3/8-18 NPT thread size
• Round female connector with one male blade terminal
• Factory-calibrated and tested for specified switch actuation
• Formed bimetal contact arm for precise electrical switching
• Built with high-grade materials for service use

Detailed Description

The Standard Ignition TS-166 coolant temperature sender is engineered to transfer an electrical signal to the fan controller through a calibrated thermal switch design. Its wax-based and bimetallic switching elements are manufactured to activate at a defined temperature, helping maintain consistent electrical response in cooling-system control circuits. This part number, TS-166, is a practical choice for vehicles that use a coolant temperature indicator light rather than a gauge-style sender. It fits 1987-1989 Chevrolet S10, 1987-1989 Chevrolet S10 Blazer, 1987-1989 GMC S15, 1987-1989 GMC S15 Jimmy, 1989 Pontiac Tempest, 1989-1990 Chevrolet Corsica, 1990-1991 Oldsmobile Cutlass Calais, 1990-1991 Oldsmobile Cutlass Supreme, 1990-1991 Pontiac Tempest, and 1990-1992 Chevrolet Lumina. This part cross-references Dorman – Conduct-Tite 85147 for the same application.

Common Uses

• Replacing a failed coolant temperature sender that no longer triggers the indicator light
• Correcting inaccurate temperature-switch operation in the cooling circuit
• Restoring electrical signal transfer to the fan controller
• Addressing intermittent or inconsistent thermal switch actuation

Installation Notes

Verify thread size, connector style, and terminal configuration before installation. The TS-166 uses a 3/8-18 NPT thread, a round plug-in connector, and a single blade terminal, so matching the original electrical and threaded interface is important for proper fitment. Confirm the vehicle uses a coolant temperature indicator light application before ordering.

Quality Assurance

Standard Ignition manufactures this sender with factory calibration and testing to confirm switch actuation at the specified temperature. The brand also states that it maintains quality control from component selection through finished product.