Coolant Temp Sensor - Large Thread 3/8 NPT 18TPI

Overview

The Haltech large thread coolant temperature sensor delivers precision engine temperature monitoring for serious builds where accurate thermal management is critical. With its robust 3/8 NPT 18TPI thread and complete Delphi connector assembly, this sensor integrates seamlessly into custom cooling system installations across LS swaps, RB builds, and turbo conversions where OEM sensor bosses won't cut it.

Technical Specifications

• Part Number: HT-010302
• Thread: 3/8 NPT 18TPI
• Connector: Delphi plug with pins included
• Temperature Range: Full automotive range
• Response Time: Fast thermal response for accurate readings

Why You Need This

Engine temperature monitoring isn't optional in modified builds — it's the difference between reliable power and catastrophic failure. The large 3/8 NPT thread makes this sensor perfect for custom radiator installations, aftermarket cylinder heads, or fabricated cooling system setups where standard M14 threads won't fit. We see this constantly in LS swap projects where custom radiator plumbing requires NPT fittings, or in RB and 2JZ builds running aftermarket heads with American-spec sensor bosses.

The included Delphi connector eliminates the frustration of sourcing proper weatherproof plugs and pins separately. Too many builds suffer from poor connections causing erratic temperature readings or complete sensor failure. This complete assembly ensures reliable data to your Haltech ECU, enabling proper fan control, timing protection, and fuel compensation as coolant temperatures fluctuate under load.

ECU & System Compatibility

Compatible with the full Haltech Elite and Nexus range including Elite 550/750/1000/1500/2000/2500 and Nexus R3/R5 systems. The sensor connects directly to any available temperature input, with calibration data pre-loaded in ESP software for immediate functionality.

What's in the Box

• Haltech coolant temperature sensor with 3/8 NPT 18TPI thread
• Delphi weatherproof connector
• Pre-crimped pins and terminals
• Sensor calibration data for ESP software

Complete Your Build

Most customers completing temperature monitoring setups also add the HT-010200 Air Temp Sensor M14x1.5 for comprehensive intake temperature tracking, and the HT-010100 GM 1 Bar MAP Sensor for load monitoring. Billy's keeps all three sensors in UK stock for immediate despatch, and our technical team can advise on optimal sensor placement for your specific build and cooling system configuration.