Purchase Volkswagen Jetta Thermostat Housing Assembly & Volkswagen Jetta Engine Coolant Thermostat Housing Gasket. Browse Volkswagen Jetta Thermostat Covers. Maintaining the thermostat housing in your Volkswagen Jetta is crucial for engine temperature regulation and overall performance. Regular inspection for corrosion or leaks can prevent premature failure, while ensuring the use of compatible coolants can extend its lifespan. When choosing a replacement, opt for high-quality materials like reinforced composite or aluminum that offer durability against temperature fluctuations. Installation requires precision, so it's advisable to follow the manufacturer's torque specifications to avoid cracks or warping. Keep an eye out for telltale signs of malfunction, such as erratic temperature readings or coolant leaks, which indicate it's time to invest in a new, reliable thermostat housing to keep your Jetta running smoothly.