Motorad 421-180 Engine Coolant Thermostat

Engine Coolant Thermostat for Suzuki and Chevrolet

Motorad Standard 421-180 is an engine coolant thermostat built to OE specifications for steady temperature control in demanding cooling systems. It uses OEM-quality materials, a copper case, and a wax compound for quick response to coolant temperature changes, with a 180°F opening temperature and included rubber O-ring seal.

Key Features

• 180°F start-to-open temperature for standard cooling system operation
• Copper case and wax compound for responsive temperature regulation
• OEM-style seals included where applicable
• Jiggle pin weep hole and air relief valve design for easier air bleeding
• Offset design for OE-style fitment
• Rubber O-ring seal included
• Motorad Standard line replacement thermostat, part number 421-180

Detailed Product Overview

This Motorad 421-180 thermostat is a direct-fit cooling system service part for select Suzuki Grand Vitara, Swift, SX4, SX4 Crossover, Vitara, and Esteem models, as well as Chevrolet Tracker applications. It is manufactured using OE supplier processes and OEM specifications to help maintain proper engine operating temperature. The 180°F calibration supports normal warm-up and temperature regulation, while the offset housing design, air relief feature, and jiggle pin weep hole help promote stable coolant flow during service. This part cross-references Remy 14378 and BBB Industries 42180 for the same application.

Common Problems This Part Can Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuations caused by a worn thermostat
• Coolant flow issues related to a sticking thermostat valve
• Air trapped in the cooling system after thermostat service
• Replacement needs for OE-style thermostat service on Suzuki and Chevrolet cooling systems

Installation Notes and Tips

Verify the thermostat orientation and sealing surface before installation. Use the included rubber O-ring seal and confirm the housing is clean and free of old gasket material. The jiggle pin weep hole and air relief design should be positioned according to the vehicle service procedure to help purge trapped air. Confirm the application by year, make, and model before ordering, especially for Suzuki Grand Vitara, Suzuki Swift, Suzuki SX4, Suzuki SX4 Crossover, Chevrolet Tracker, Suzuki Vitara, and Suzuki Esteem.

Quality Assurance

Motorad Standard thermostats are manufactured to OEM specifications and processes by an OE supplier, using materials selected for OE-level cooling system service. The copper case and wax compound are engineered for consistent response to coolant temperature changes.