Speedmaster 200/185 Degrees 3/8" NPT Thermostatic Fan Control Sending Unit Switch PCE184.1003

The Speedmaster PCE184.1003 is a thermostatic fan control sending unit switch designed to automatically engage cooling fans based on coolant temperature. This 3/8" NPT threaded unit activates at 200 degrees and closes at 185 degrees, providing reliable thermal management for automotive engine cooling systems and custom hot rod builds. The switch integrates directly into the cooling system to monitor temperature and trigger fan operation without manual intervention.

Ideal for engine builders, restoration shops, and performance enthusiasts, this Speedmaster control unit delivers precision temperature switching in a compact, durable package. The 3/8" NPT fitting ensures compatibility with standard cooling system ports on many classic and modern engines. Built as a direct replacement or upgrade component, it allows you to maintain optimal engine temperatures while reducing parasitic fan drag at lower speeds—a key benefit for both street and show vehicles seeking reliable thermal control and improved efficiency.

Key Features & Benefits

• 200/185 Degree Rating: Activates fan engagement at 200 degrees Fahrenheit and closes at 185 degrees for precise temperature control.
• 3/8" NPT Thread: Standard 3/8" National Pipe Thread connection fits most cooling system ports on automotive engines.
• Thermostatic Sending Unit: Automatically switches fan operation based on coolant temperature without electrical input or manual adjustment.
• Engine Cooling Application: Designed for hot rod, street rod, and performance engine builds requiring reliable thermal management.
• Compact Design: Direct-fit replacement for OEM cooling fan switches in custom and restoration projects.

Specifications

Ideal Applications

• Engine cooling system temperature control in hot rod and street rod builds
• Custom automotive cooling fan engagement without electronic thermostat modules
• Classic car and muscle car restoration cooling management
• Performance engine applications requiring automatic fan thermal switching