Mahle B33276 Engine Coolant Thermostat Housing O-Ring

Mahle B33276 Thermostat Housing O-Ring

Mahle B33276 is an engine coolant thermostat housing O-ring for select Chevrolet and GMC trucks and vans. It is a molded rubber sealing component used at the by-pass to lower housing connection to help maintain a secure coolant seal.

Key Features

• Engine coolant thermostat housing O-ring for cooling system sealing
• Molded rubber construction
• Direct-fit replacement for the by-pass to lower housing location
• Compatible with select Chevrolet Express, Silverado, GMC Savana, and Sierra applications
• Mahle sealing product line used by OEMs and technicians worldwide

Detailed Description

This Mahle B33276 thermostat housing O-ring is built for cooling system service where a reliable seal is required at the thermostat housing bypass-to-lower-housing connection. It is a direct replacement for applications including Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD, along with select Express and Savana vans. This part cross-references FEL-PRO 35762 and General Motors 94011602 for the same application. If you are servicing a Chevrolet Silverado or GMC Sierra cooling system, B33276 provides the correct molded rubber sealing profile for the specified fitment.

What It Helps Address

• Coolant seepage at the thermostat housing seal
• Loss of sealing integrity at the bypass to lower housing joint
• Coolant odor or visible residue around the housing area
• Service replacement for worn, flattened, or hardened O-rings
• Cooling system leaks during thermostat housing repair

Installation Notes and Tips

• Verify the housing style and engine application before installation.
• Clean the sealing surfaces thoroughly before fitting the new O-ring.
• Inspect the thermostat housing and mating surfaces for damage or corrosion.
• Use the listed fitment to confirm compatibility with your Chevrolet Express, Silverado, GMC Savana, or Sierra.

Quality Assurance

Mahle gaskets and sealing components are supplied for OEM-level service applications and are trusted by technicians for cooling system repairs. Confirm fitment by year, make, and model before installation.