Motorad 5203-180 Engine Coolant Thermostat

Motorad UltraStat 5203-180 Thermostat

The Motorad UltraStat 5203-180 is an engine coolant thermostat built for direct-fit cooling system service on a wide range of GM, Suzuki, Isuzu, Geo, Buick, Oldsmobile, and Pontiac applications. This 180 degree thermostat uses heavy-gauge stainless steel construction for corrosion resistance and long-term durability.

UltraStat thermostat technology is engineered to reduce thermal shock in the cooling system, helping the engine reach and maintain operating temperature with more controlled coolant flow. For shoppers searching for a 180F thermostat for Chevrolet S10, GMC Sonoma, or Pontiac Firebird applications, this part number is a direct replacement option.

Key Features

• 180 degree Fahrenheit engine coolant thermostat
• Heavy-gauge stainless steel construction for corrosion resistance
• BLVT valve technology to minimize thermal shock
• Sealing flange outside diameter: 1.73 in
• Flange thickness: 0.04 in
• No gasket or seal included
• No jiggle pin weep hole
• No installation tool included

Product Details

Motorad UltraStat thermostats are designed for precise coolant temperature control in everyday street and fleet use. The 5203-180 is a 180°F engine coolant thermostat that matches original-equipment style applications across many older domestic and import vehicles. This part cross-references Stant 45848 for the same application. The Motorad 5203-180 is also listed among interchange references for related OE replacement searches.

Fits 1990-2003 Chevrolet S10, N/A; fits 1991-2003 GMC Sonoma, N/A; fits 1989-1997 Chevrolet Camaro, N/A; fits 1989-1997 Pontiac Firebird, N/A; fits 1995-2000 Suzuki Esteem, N/A; fits 1996-2000 Isuzu Hombre, N/A; fits 1992-1995 Chevrolet Astro, N/A; fits 1986-1995 Buick LeSabre, N/A; fits 1986-1994 Oldsmobile 98, N/A; fits 1991-1995 GMC Safari, N/A.

Common Uses

• Restoring proper engine operating temperature
• Replacing a thermostat stuck open or stuck closed
• Addressing slow warm-up or temperature fluctuation concerns
• Supporting stable coolant flow in aging cooling systems
• Service replacement for 180°F OE thermostat applications

Installation Notes

Verify housing dimensions and engine application before installation. Because no gasket or seal is included, use the correct separate sealing component for the vehicle and inspect the thermostat housing, mating surfaces, and coolant condition during service. Bleed air from the cooling system after installation and confirm normal warm-up and temperature regulation.

Quality Assurance

Motorad UltraStat thermostats use stainless steel construction and valve technology focused on durability and controlled thermal response. The 5203-180 is built as a direct replacement thermostat for confirmed fitment applications, including Chevrolet S10, GMC Sonoma, and Pontiac Firebird models.