Stant 13378 Engine Coolant Thermostat

OE Type Thermostat for Import Cooling Systems

The Stant 13378 engine coolant thermostat is built to OE-type dimensions and a 180-degree opening temperature for consistent coolant flow control. It is a direct-fit cooling system service part for a wide range of Volkswagen, Audi, Volvo, Porsche, Jaguar, and select Ford applications.

Stant OE Type Thermostat 13378 uses a durable construction with a stainless steel assembly for smooth operation and long service life. For drivers servicing a Volkswagen Jetta thermostat or an Audi A3 Quattro cooling system, this part provides the temperature control needed to maintain proper engine operating range.

Key Features

• OE Type Thermostat from Stant
• Part Number: 13378
• 180-degree opening temperature
• Original equipment design for accurate fit and function
• Durable material construction for long service life
• Stainless steel assembly engineered for smooth performance
• Bypass plate diameter: 1.375 in.
• Flange diameter: 2.125 in.
• Height from flange to bottom: 1.2 in.
• Height from flange to top of bridge: 0.78 in.

Detailed Description

This Stant OE Type Thermostat 13378 is designed for vehicles that require a 180-degree engine coolant thermostat with OE-style geometry. The original equipment design helps maintain proper coolant regulation, while the stainless steel assembly supports consistent opening and closing action under normal operating conditions. It is a practical replacement for cooling system service on many Volkswagen Golf, Jetta, Passat, and Beetle models, along with select Audi A3 Quattro and Volvo applications.

This part cross-references 45378 for the same application.

What It Helps Address

• Engine running too cool or too warm due to thermostat wear
• Delayed coolant circulation after startup
• Temperature fluctuation during normal driving
• Cooling system service on high-mileage import vehicles
• Replacement of an OE-style thermostat with the correct 180-degree rating

Installation Notes and Tips

• Verify the thermostat housing and sealing surfaces before installation.
• Confirm the 180-degree temperature specification matches the vehicle requirement.
• Use the fitment notes to match the exact year, make, and model.
• Bleed air from the cooling system after service to restore proper circulation.
• Check coolant condition and replace degraded coolant during thermostat service.

Quality Assurance

Stant OE Type Thermostat parts are built to OE design standards with durable materials and a stainless steel assembly for dependable operation. Part number 13378 is engineered for direct replacement use in listed applications.