Description
Part Number: 01M 321 435B
Product Name: Transmission Filler Cap
Compatible Transmission: VW 01M Series Automatic Transmission
Core Functions
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Sealing & Leak Prevention: Ensures complete sealing of the transmission fluid filler port to prevent leaks and contamination.
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Pressure & Temperature Resistant: Made of high-strength engineering plastic, designed to withstand transmission operating temperatures and pressure fluctuations.
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Easy Operation: Screw-on design for tool-free installation and removal.
Vehicle Compatibility
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Volkswagen Jetta (1999-2005)
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Volkswagen Golf (1998-2006)
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Other VW/Audi models equipped with 01M automatic transmission
Replacement Indicators
⚠️ Common Failure Signs
▸ Visible fluid seepage around the filler port
▸ Cracks or worn threads on the cap
▸ Unusual transmission fluid odor or contamination
⚠️ Maintenance Tip
Recommended to inspect this component during transmission fluid changes. A worn cap may accelerate fluid oxidation.
Installation Guide
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Clean the threads of the filler port thoroughly.
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Screw the cap clockwise until snug (avoid over-tightening).
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Check for leaks after starting the engine.
Technical Note: This part is integral to the transmission ventilation system. Maintaining a proper seal helps prevent moisture ingress and preserves fluid performance.
Let me know if you’d like to add material specifications or an installation diagram!
