Motorad 339-180 Engine Coolant Thermostat

Reliable Engine Coolant Thermostat for Buick and Cadillac Models

The Motorad Standard 339-180 engine coolant thermostat is designed to maintain optimal engine temperature for select Buick, Cadillac, Oldsmobile, and Pontiac vehicles. Engineered to open at 180°F, this thermostat ensures efficient coolant flow and engine performance.

• Sealing flange outside diameter: 2.11 inches
• Height between flanges: 1.94 inches
• Overall height: 2.77 inches
• Standard type thermostat with jiggle pin weep hole
• Includes rubber O-ring gasket for secure sealing
• Bypass diameter: 1.38 inches; bypass length: 1.97 inches
• Flange thickness: 0.05 inches
• Start to open temperature: 180°F
• One seal included; installation tool not included

About the Motorad Standard Product Line

The Motorad Standard line offers dependable engine cooling components designed to meet OEM specifications. This line focuses on providing quality replacement parts like the 339-180 thermostat, which balances performance and durability for vehicles such as the Cadillac DeVille and Buick Lucerne.

Detailed Product Description

The Motorad Standard 339-180 engine coolant thermostat is a precision-engineered component that regulates coolant flow based on engine temperature. Featuring a 180°F opening temperature, it helps maintain consistent engine operating conditions. The thermostat includes a jiggle pin weep hole to prevent air lock and a rubber O-ring gasket to ensure a tight seal within the housing. Its dimensions, including a 2.11-inch sealing flange outside diameter and 1.94-inch height between flanges, are designed for direct compatibility with various GM models like the Pontiac Bonneville and Cadillac SRX.

Common Applications and Issues Addressed

• Prevents engine overheating by regulating coolant flow
• Helps avoid poor heater performance due to thermostat failure
• Reduces risk of coolant leaks with included rubber gasket
• Addresses engine temperature fluctuations in Buick Allante and Cadillac STS
• Supports proper engine warm-up times for Oldsmobile and Pontiac vehicles

Installation Notes and Tips

Installation of the Motorad 339-180 thermostat requires removal of the old thermostat and housing. Ensure the sealing surfaces are clean before installing the new thermostat with the included rubber O-ring gasket. No special installation tool is included, so use appropriate hand tools and follow vehicle-specific service manual instructions. Verify the jiggle pin is oriented correctly to allow air bleed during coolant flow.

Quality Assurance and Warranty

Motorad Standard thermostats are manufactured to meet or exceed OEM standards for fit and function. The 339-180 thermostat includes a single rubber seal to ensure leak-free operation. While specific warranty details are not provided, Motorad products typically undergo rigorous quality control to ensure reliability in compatible Buick, Cadillac, Oldsmobile, and Pontiac models.