Velt Sport Aluminum Thermostat Housing (ALH) - VW / Mk4 / 1.9L / TDI / Beetle / Golf / Jetta

Aluminum Thermostat Housing - VW Mk4 Beetle, Golf & Jetta 1.9L TDI

Upgrade your Volkswagen Mk4 1.9L TDI’s cooling system with this premium aluminum thermostat housing, engineered to replace the factory plastic unit that often cracks or leaks over time. Cast from durable aluminum, this housing offers superior strength, heat resistance, and long-term reliability, perfect for both daily drivers and performance-tuned TDIs.

Designed as a direct OEM replacement, this housing fits Mk4 Beetle, Golf, and Jetta models equipped with the 1.9L TDI engine. Installation is straightforward, with factory-style mounting and perfect sealing surfaces to ensure a leak-free fit.

Key Features:

• Fits VW Mk4 Beetle, Golf & Jetta 1.9L TDI engines (ALH & BEW)
• Cast aluminum for maximum durability and heat resistance
  
• Direct replacement for the factory plastic thermostat housing
• Prevents common coolant leaks and cracking issues
• Ideal for maintenance or performance cooling upgrades
• Lifetime warranty for peace of mind

OE Part #'s


038-121-121 / 038 121 121 / 038121121

381-211-21 / 381 211 21 / 38121121