Motorad 339-180 Engine Coolant Thermostat

180F Engine Coolant Thermostat

Motorad Standard 339-180 is an engine coolant thermostat built for OE-style temperature control in demanding cooling systems. It opens at 180°F and includes an O-ring seal, rubber gasket material, and a jiggle pin weep hole for air relief during service.

Fits 2006-2011 Buick Lucerne, N/A. Fits 2006-2011 Cadillac DTS, N/A. Fits 2005-2010 Cadillac STS, N/A. Fits 2004-2009 Cadillac SRX, N/A. Fits 2004-2009 Cadillac XLR, N/A. Fits 1994-2005 Cadillac DeVille, N/A. Fits 2004-2005 Pontiac Bonneville, N/A. Fits 1993-2004 Cadillac Seville, N/A. Fits 2001-2003 Oldsmobile Aurora, N/A. Fits 1995-1999 Oldsmobile Aurora, N/A. Fits 1993-2002 Cadillac Eldorado, N/A. Fits 1993 Cadillac Allante, N/A.

Key Features

• 180°F start-to-open temperature for OE-specified coolant regulation
• Standard thermostat design with copper case and wax compound for responsive temperature changes
• Offset design with air relief valve where applicable
• Includes gasket/seal and one O-ring seal
• Jiggle pin weep hole helps purge trapped air during filling and service
• Rubber seal material for a secure housing interface
• Motorad Standard line replacement for select Cadillac, Buick, Pontiac, and Oldsmobile applications

Detailed Description

Motorad 339-180 is a standard engine coolant thermostat engineered to maintain proper operating temperature in vehicles that call for a 180°F thermostat. Manufactured to OEM specifications and processes, it uses OEM-quality materials and a copper case with wax compound to react quickly as coolant temperature changes. That response helps the cooling system regulate temperature consistently in applications such as the Cadillac DeVille, Cadillac Seville, Cadillac Eldorado, Buick Lucerne, and Pontiac Bonneville.

The Motorad Standard line focuses on direct-fit cooling system service parts built to OE-style dimensions and sealing requirements. This thermostat measures 2.77 in. tall, with a 2.11 in. sealing flange outside diameter, 1.94 in. height between flanges, and a 1.38 in. bypass diameter. The included seal uses an O-ring design with rubber material, and the jiggle pin weep hole supports air bleeding during installation.

This part cross-references Carlson 14228 for the same application.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Slow warm-up after cold starts
• Temperature fluctuation in the cooling system
• Coolant flow control issues caused by a sticking thermostat
• Air trapped in the cooling system after service

Installation Notes and Tips

Verify the housing and sealing surfaces are clean before installation. Confirm the application calls for a 180°F thermostat and compare the bypass dimensions and flange measurements to the original part. Some listed applications note that an additional gasket or seal may be required; review the vehicle-specific service procedure before installation. Bleed air from the cooling system after refill to help prevent hot spots and temperature instability.

Quality Assurance

Manufactured by an OE supplier using OEM-quality materials and safety standards, this thermostat is built to meet the demands of automotive cooling systems. Motorad 339-180 is produced to OEM specifications and processes for consistent fit and temperature control.