Motorad 511-185 Engine Coolant Thermostat

OE-Style 185°F Engine Coolant Thermostat

Motorad Standard 511-185 is an engine coolant thermostat built to OE specifications for temperature control in the cooling system. It uses a copper case and wax compound for quick reaction to coolant temperature changes, and it includes an O-ring seal and jiggle pin weep hole where applicable.

Compatible With select Buick Lucerne, Chevrolet Impala, Chevrolet Malibu, Pontiac G6, and Saturn Vue applications, this 185°F thermostat supports stable engine operating temperature in vehicles that rely on precise coolant flow control. The Motorad Standard line focuses on OE-style replacement parts for everyday service work.

Key Features

• 185°F start-to-open temperature for standard cooling system operation
• OE supplier manufacturing with OEM quality materials and processes
• Copper case and wax compound for responsive temperature regulation
• Offset design with air relief valve where applicable
• Includes gasket/seal with rubber O-ring seal type
• Jiggle pin weep hole helps with air bleeding during service
• Sealing flange outside diameter: 1.72 in
• Height: 2.67 in; height between flanges: 1.87 in
• Bypass diameter: 1.09 in; bypass length: 1.89 in
• Flange thickness: 0.05 in

Detailed Description

Motorad 511-185 is a standard engine coolant thermostat engineered for direct replacement service in OE-specified cooling systems. The thermostat is built with a copper case and wax element to react quickly as coolant temperature rises and falls, helping maintain the engine’s intended operating range. Its OE-style seals and offset design support proper fitment in applications that require a 185°F thermostat, including 2006-2011 Chevrolet Impala, 2006-2010 Chevrolet Malibu, and 2008-2010 Saturn Vue.

This part cross-references Four Seasons 57885 for the same application.

What It Helps Address

• Engine running too cool or too warm
• Delayed coolant flow regulation after startup
• Temperature fluctuation in the cooling system
• Service replacement for a worn thermostat seal
• Air trapped in the cooling circuit during thermostat service

Installation Notes and Tips

• Verify the 185°F temperature specification before installation.
• Inspect the thermostat housing and sealing surfaces for corrosion or debris.
• Use the included seal and confirm correct O-ring seating.
• Orient the jiggle pin/weep hole as required by the application.
• Refill and bleed the cooling system according to the vehicle service procedure.

Quality Assurance

Motorad manufactures this thermostat to OEM specifications and processes as an OE supplier, using materials selected for demanding automotive cooling systems. The Standard line provides OE-style replacement coverage for service technicians and DIY repairs.