Standard Ignition TS-203 Engine Coolant Temperature Sender

Engine Coolant Temperature Sender Overview

Standard Ignition TS-203 is an engine coolant temperature sender built for vehicles that use a coolant temperature indicator light on the dashboard. It features a bolt-on design, a 3/8-18 thread size, a brass finish, and a single female plug-in connector with a square shape for straightforward electrical connection.

Fits 1985-1988 Chevrolet Nova and 1983 Toyota Corolla with a coolant temperature indicator light on the dashboard. This TS-203 sender is also cross-referenced to Baldwin 20007 for the same application.

Key Features

• Engine coolant temperature sender for dashboard indicator light systems
• Bolt-on attachment method for secure mounting
• 3/8-18 thread size
• Single female plug-in connector with square connector shape
• Brass finish with red housing
• Male blade terminal design
• Factory-calibrated and tested for specified switch actuation temperature
• Uses a formed bimetallic contact arm for precise electrical switching

Detailed Description

Standard Ignition TS-203 is engineered for coolant temperature warning circuits that rely on a sender to trigger the indicator light. The internal thermal design uses calibrated wax and bimetallic contact movement to create a precise snap-action electrical signal at the specified temperature point. That controlled switching helps the vehicle’s warning system respond consistently when coolant temperature reaches the set threshold.

For fitment-focused searches, this part is a direct option for 1985-1988 Chevrolet Nova coolant temperature indicator light service and 1983 Toyota Corolla coolant temperature indicator light service. The TS-203 combines OE-style construction with quality-controlled manufacturing from component to finished unit.

What It Helps Address

• Inoperative or intermittent coolant temperature warning light
• Incorrect temperature signal to the dashboard indicator circuit
• Sender-related warning light delay or failure to activate
• Electrical contact issues at the coolant temperature switch point
• Replacement needs for worn or inaccurate temperature senders

Installation Notes and Tips

Verify the thread size, connector style, and indicator-light application before installation. This TS-203 uses a single female plug-in connector and a bolt-on mounting style, so the vehicle harness and sender opening must match those specifications. Confirm the cooling system is at a safe temperature before removing the existing sender.

For best results, inspect the connector terminal, wiring condition, and sealing surface during replacement. On vehicles such as the Chevrolet Nova and Toyota Corolla listed above, confirm the dashboard warning circuit is designed for a coolant temperature indicator light rather than a gauge sender.

Quality Assurance

Standard Ignition states that each unit is calibrated and tested to confirm switch actuation at the specified temperature. The brand also maintains quality control throughout manufacturing, from internal components to the finished sender, to support consistent electrical performance.