Vemo V15-99-1990 Engine Coolant Thermostat

Engine Cooling Control for Select Audi and Jaguar Models

The Vemo V15-99-1990 engine coolant thermostat helps regulate coolant flow so the engine reaches and maintains the correct operating temperature. With an 88°C opening temperature and included gasket reference in the fitment notes, it is a direct replacement choice for select Audi, Volkswagen, and Jaguar applications.

VEMO product line parts are built for European vehicle service needs, with application-specific fitment and OE-style dimensions for straightforward replacement work. This thermostat measures 50 mm high, 60 mm long, and 65 mm wide, with a compact 0.123 kg weight for easy handling during cooling system service.

Key Features

• Engine coolant thermostat with 88°C opening temperature
• Vemo part number V15-99-1990
• OE-style dimensions: 50 mm height, 60 mm length, 65 mm width
• Lightweight design at 0.123 kg
• Fits select Audi A4, A6, A8, S4, Allroad Quattro, and Volkswagen Passat applications
• Also listed for Jaguar XJR, XK, XKR, S-Type, and XJ8 applications

Detailed Description

The Vemo V15-99-1990 is an engine coolant thermostat for vehicles that require an 88°C thermostat setting to manage warm-up and operating temperature. It is listed across a wide range of Audi fitments, including 1990-1998 Audi 100, 100 Quattro, 90, 90 Quattro, Cabriolet, V8 Quattro, A4, A4 Quattro, A6, A6 Quattro, A8, and A8 Quattro, plus 2000-2005 Audi Allroad Quattro and 2000-2002 Audi S4. It also fits 1998-2001 Volkswagen Passat and select 2006-2009 Jaguar XJR, XK, XKR, S-Type, and XJ8 applications.

This part cross-references Gates 22587 and Stant 13588 for the same application. If you are searching for an Audi A6 Quattro thermostat 88°C, a Volkswagen Passat engine coolant thermostat, or a Jaguar S-Type thermostat replacement, V15-99-1990 is the catalog reference to verify.

What It Helps Address

• Engine running too cool or taking too long to reach operating temperature
• Temperature fluctuation caused by a worn thermostat
• Cooling system service on Audi A4, A6, A8, and S4 models
• Thermostat replacement on Volkswagen Passat and Audi Allroad Quattro applications
• Cooling control service on Jaguar XJR, XK, XKR, S-Type, and XJ8 vehicles

Installation Notes and Tips

• Verify the VIN breakpoints listed in the fitment notes before ordering, especially for Audi A4, A6, and Volkswagen Passat applications.
• Inspect the thermostat housing and sealing surfaces before installation.
• Replace the gasket only if your service procedure calls for it and the correct sealing components are on hand.
• Bleed the cooling system after installation to remove trapped air and confirm stable operating temperature.
• Confirm the 88°C specification matches the original thermostat requirement for the vehicle.

Quality Assurance

Vemo V15-99-1990 is cataloged with application-specific fitment data and OE-style sizing for European cooling system service. The VEMO line is used for replacement parts across Audi, Volkswagen, and Jaguar platforms, including long-tail searches such as 2000-2004 Audi A6 Quattro thermostat and 2007-2009 Jaguar XK engine coolant thermostat.