Dorman 902-5870 Engine Coolant Thermostat Housing Assembly

Reliable Engine Coolant Thermostat Housing Assembly for Audi and Volkswagen

The Dorman 902-5870 Engine Coolant Thermostat Housing Assembly is designed to maintain optimal engine temperature for select Audi and Volkswagen models. This assembly includes a thermostat and gasket, ensuring a precise fit and reliable performance for your Golf R, S3, TT, TT Quattro, or TTS Quattro.

• Durable black plastic construction for corrosion resistance
• Includes thermostat with 176°F opening temperature
• Comes with a standard gasket and O-ring for a secure seal
• Two mounting holes with 2.71-inch bolt hole center spacing
• Flange dimensions: 3.4 inches wide, 2.5 inches long, 0.4 inches thick
• Single outlet port design for efficient coolant flow

Product Details and Specifications

This engine coolant thermostat housing assembly by Dorman is made from high-quality plastic, providing durability and resistance to heat and corrosion. The included thermostat opens at 176 degrees Fahrenheit, helping regulate engine temperature effectively. The housing features two mounting holes spaced 2.71 inches apart, ensuring a secure fit on compatible vehicles. Its flange measures 3.4 inches in width, 2.5 inches in length, and 0.4 inches in thickness, designed to match OEM specifications. The assembly includes a standard gasket and an O-ring to prevent leaks and maintain a tight seal. Note that mounting hardware is not included.

Compatible Vehicles and Applications

• Designed for Audi Golf R models
• Compatible with Volkswagen S3 and TT series, including TT Quattro and TTS Quattro
• Ideal for replacing worn or damaged thermostat housings in these vehicles
• Helps maintain proper engine temperature and coolant flow

Common Issues Addressed by This Thermostat Housing Assembly

• Engine overheating due to faulty thermostat housing leaks
• Coolant leaks from cracked or damaged housing
• Inconsistent engine temperature regulation
• Failed thermostat causing poor engine performance
• Corrosion-related housing failure

Installation Notes and Tips

Before installation, ensure the engine is cool to avoid injury. Remove the old thermostat housing carefully to prevent damage to surrounding components. Clean the mounting surface thoroughly to ensure a proper seal with the included gasket and O-ring. Since mounting hardware is not included, reuse existing bolts if they are in good condition or source OEM replacements. Verify the thermostat orientation matches the original setup for accurate temperature regulation.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 902-5870 thermostat housing assembly undergoes rigorous quality checks to ensure durability and reliable performance. While specific warranty details are not provided, Dorman typically offers limited warranties on their replacement parts to cover defects in material and workmanship.