Motorad 5203-180 Engine Coolant Thermostat

Reliable Engine Coolant Thermostat for Select GM and More Vehicles

The Motorad UltraStat 5203-180 engine coolant thermostat is designed to maintain optimal engine temperature for a range of vehicles including Buick, Chevrolet, GMC, and more. Engineered to open at 180 degrees Fahrenheit, this thermostat helps regulate coolant flow efficiently to support engine performance and longevity.

• Sealing flange outside diameter: 1.73 inches
• Flange thickness: 0.04 inches
• Temperature rating: 180°F
• No gasket or seal included
• No jiggle pin weep hole
• Installation tool not included

About the Motorad UltraStat Product Line

The UltraStat line from Motorad focuses on precision-engineered thermostats designed for consistent temperature control and durability. This product line emphasizes exact temperature activation points, such as the 180°F rating of the 5203-180 thermostat, ensuring reliable coolant regulation for compatible vehicles. UltraStat thermostats are built to meet or exceed OEM specifications for fit and function.

Product Details and Specifications

The Motorad UltraStat 5203-180 thermostat features a sealing flange with an outside diameter of 1.73 inches and a flange thickness of 0.04 inches, providing a secure fit within the cooling system housing. It is calibrated to open at 180 degrees Fahrenheit, allowing coolant to circulate once the engine reaches optimal operating temperature. This thermostat does not include a gasket or seal, nor does it have a jiggle pin weep hole, so ensure proper sealing during installation. The part is compatible with a wide range of vehicles including Buick 88 and 98 models, Chevrolet Camaro and Blazer, GMC Sierra and Jimmy, as well as Isuzu Trooper and Suzuki Esteem among others.

Compatible Vehicles and Applications

• Buick 88, 98, LeSabre, Park Avenue
• Chevrolet Camaro, Blazer, Cavalier, S10, Silverado (C1500, C2500, C3500)
• GMC Jimmy, Sierra, Suburban (K2500, K3500, R2500, R3500)
• Isuzu Trooper, Hombre
• Oldsmobile Cutlass, Delta 88, Silhouette
• Pontiac Firebird, Grand Am, Sunfire
• Geo Metro, Tracker, Suzuki Esteem, Swift

Common Issues Addressed by This Thermostat

• Engine overheating due to thermostat failure
• Poor engine warm-up performance
• Inconsistent coolant flow causing temperature fluctuations
• Reduced fuel efficiency from improper engine temperature
• Potential engine damage from prolonged overheating

Installation Notes and Tips

When installing the Motorad UltraStat 5203-180 thermostat, verify the sealing flange dimensions to ensure proper fit. Since this thermostat does not include a gasket or seal, use a compatible gasket or sealant recommended for your vehicle. The absence of a jiggle pin weep hole means extra attention should be given to bleeding air from the cooling system after installation. No special installation tool is included, so standard tools for thermostat replacement are required. Always follow vehicle manufacturer guidelines for thermostat replacement procedures.

Quality Assurance and Warranty

Motorad UltraStat thermostats are manufactured to meet OEM standards for durability and performance. While specific warranty details for part number 5203-180 are not provided, Motorad products typically come with a limited warranty against defects in materials and workmanship. For warranty information, consult the product documentation or contact the distributor.