Gates 34821 Engine Coolant Thermostat

Reliable Cooling with Gates Integrated Housing Thermostat 34821

The Gates Integrated Housing Thermostat 34821 is engineered to maintain optimal engine temperature for select Mercedes-Benz models. Designed with precision, this thermostat ensures efficient coolant flow and temperature regulation to support engine performance and longevity.

• Integrated housing thermostat design with 3 bolt holes for secure mounting
• Start to open temperature at 87°C (189°F) for accurate thermal control
• Outlet inside diameter of 1.665 inches for proper coolant flow
• Includes a check valve and one seal for reliable operation
• OE exact fit and quality for Mercedes-Benz E350, GL320, GL350, ML320, ML350, R320, R350, Sprinter 2500, Sprinter 3500, and Sprinter 3500XD

Product Line Details: Gates Integrated Housing Thermostat

The Gates Integrated Housing Thermostat line combines the thermostat and housing into a single unit, simplifying installation and reducing potential leak points. This design enhances cooling system reliability by ensuring a precise fit and consistent temperature regulation. The 34821 part number represents an OE exact replacement, meeting original equipment specifications for Mercedes-Benz vehicles.

Technical Description and Features

This engine coolant thermostat features a start to open temperature of 87°C (189°F), which allows it to regulate engine temperature effectively by opening at the precise moment coolant flow is needed. The integrated housing includes three bolt holes for secure attachment and an outlet inside diameter of 1.665 inches to maintain proper coolant circulation. The thermostat is non-electric and includes a check valve and one seal to prevent coolant backflow and leaks. The absence of a jiggle pin weep hole is consistent with the original equipment design.

Common Applications and Problem Solving

• Prevents engine overheating by regulating coolant flow
• Replaces faulty or stuck thermostats causing temperature fluctuations
• Eliminates coolant leaks from worn or damaged thermostat housings
• Restores proper engine warm-up times for Mercedes-Benz E350, GL320, ML350, and Sprinter models
• Ensures consistent engine temperature for improved fuel efficiency and emissions control

Installation Notes and Tips

When installing the Gates Integrated Housing Thermostat 34821, ensure the mounting surface is clean and free of debris to prevent leaks. Use the three bolt holes to secure the housing firmly, and verify the seal is properly seated to maintain coolant system integrity. This thermostat is designed for non-electric operation and does not include a jiggle pin weep hole, so follow vehicle-specific service procedures for coolant system bleeding.

Quality Assurance and Warranty

The Gates Integrated Housing Thermostat 34821 is manufactured to meet OE exact specifications, ensuring compatibility and reliable performance in Mercedes-Benz vehicles. This part undergoes rigorous quality control to maintain durability and function. Warranty coverage details should be confirmed with the parts provider or manufacturer documentation.