OE Aftermarket VAG5Q0121407A-100F Coolant Expansion Tank

The OE Aftermarket VAG5Q0121407A-100F is a high-quality coolant expansion tank designed as a direct replacement for Volkswagen Audi Group vehicles. This essential cooling system component provides a reservoir for excess coolant fluid as it expands and contracts with temperature changes, ensuring proper engine temperature regulation and preventing overheating.

Key Features:

• Durable polypropylene (PP) construction for long-lasting performance
• Integrated coolant level sensor with 2-pin connector for accurate monitoring
• Includes mounting clips for secure installation
• Gray finish matches OEM specifications
• Complete with cap and sensor assembly
• Approximate dimensions: 7.87" x 7.87" x 6.30" (L x W x H)

This expansion tank helps maintain optimal coolant levels throughout the engine's heating and cooling cycles. The transparent design allows for easy visual inspection of coolant level and condition. When the coolant expansion tank fails, symptoms may include persistent low coolant warnings, visible coolant leaks, or engine overheating. Replacing a damaged expansion tank promptly helps prevent serious engine damage and maintains cooling system efficiency.

OEM Cross-Reference Numbers: 5Q0121407A, 5Q0121407D, 5Q0121407F, 5Q0121407G, 5Q0121407M, 5Q0121407T