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Win this M240i!
Every $50 spent = 1 entry*

No purchase necessary to enter or win. See official rules.

Expansion Tank Cap

Keep proper pressure in your coolant system
Mfg Part #
3B0121321
ECS Part #
ES#2709040
Brand
URO
3.94
Free Shipping Free Shipping
on orders $49 and up
Availability: In Stock
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Product Details

The coolant expansion tank cap maintains an elevated cooling system pressure to raise the boiling point of the liquid coolant, while venting excessive pressure to atmosphere. These caps have a limited service life; they should be pressure-tested as part of a routine maintenance schedule, and replaced as part of any major cooling system overhaul.

This bright blue cap includes a replacement o-ring, and dresses up the appearance of any engine bay.

This Part Fits the Following Vehicles

Make Model Submodel Engine
Audi 8J TTRS Quattro 2.5T
Audi 8V S3 Quattro 2.0T
Audi A3 8P FWD 2.0T
Audi A3 8P FWD TDI
Audi A3 8P Quattro 2.0T
Audi A3 8P Quattro 3.2L
Audi A3 8P Quattro V6 3.2L
Audi A3 8V FWD 1.4 e-tron
Audi A3 8V FWD 1.8T
Audi A3 8V FWD 2.0T
Audi A3 8V FWD TDI
Audi A3 8V Quattro 2.0T
Audi A7 C7 3.0T
Audi B5 A4 FWD 1.8T
Audi B5 A4 FWD V6 12v
Audi B5 A4 FWD V6 30v
Audi B5 A4 Quattro 1.8T
Audi B5 A4 Quattro V6 12v
Audi B5 A4 Quattro V6 30v
Audi B5 S4 All 2.7T
Audi B6 A4 FWD 1.8T
Audi B6 A4 FWD V6 30v
Audi B6 A4 Quattro 1.8T
Audi B6 A4 Quattro V6 30v
Audi B6 S4 All V8
Audi B7 A4 FWD 2.0T
Audi B7 A4 Quattro 2.0T
Audi B7 A4 Quattro V6 3.2L
Audi B7 RS4 All V8
Audi B7 S4 All V8
Audi B8 A4 All 2.0T
Audi B8 A4 All V6 3.2L
Audi B8 A4 FWD All
Audi B8 A4 Quattro All
Audi B8 A4 FWD 2.0T
Audi B8 A4 Quattro 2.0T
Audi B8 A4 Quattro V6 3.2L
Audi B8 A5 Quattro 2.0T
Audi B8 A5 Quattro V6 3.2L
Audi B8 S4 Quattro 3.0T
Audi B8 S5 Quattro 3.0T Cabriolet
Audi B8 S5 Quattro 3.0T Coupe
Audi B8 S5 Quattro V8 4.2L
Audi B8 SQ5 Quattro 3.0T
Audi C5 A6 Quattro 2.7T
Audi C5 A6 Quattro 4.2
Audi C5 A6 FWD V6 2.8L
Audi C5 A6 Quattro V6 2.8L
Audi C5 Allroad Quattro 2.7T
Audi C5 Allroad Quattro 4.2L
Audi C5 S6 Quattro 4.2
Audi C7 A6 FWD 2.0T
Audi C7 A6 FWD V6 3.0T
Audi C7 A6 Quattro 2.0T
Audi C7 A6 Quattro 3.0 TDI
Audi C7 A6 Quattro V6 3.0T
Audi C7 S6 Quattro 4.0T
Audi D4 A8 Quattro 3.0 TDI
Audi D4 A8 Quattro 3.0T
Audi D4 A8 Quattro 4.0T
Audi Q5 Quattro 3.0 TDI
Audi Q5 All 2.0T
Audi Q5 All 3.0 TDI
Audi Q5 Quattro 3.0T
Audi Q5 Quattro 3.2L
Audi Q5 2.0T All
Audi Q5 Quattro All
Audi Q5 Quattro 2.0T
Audi Q5 All 3.0T
Audi Q5 All 3.2L
Audi Q7 All 3.0T
Audi Q7 All V6
Audi Q7 All V8
Audi RS6 All 4.2T
Audi RS7 Quattro 4.0T
Audi TT MKI FWD 180HP
Audi TT MKI Quattro 180HP
Audi TT MKI Quattro 225HP
Audi TT MKI Quattro 3.2L
Audi TT MKII FWD 2.0T
Audi TT MKII Quattro 2.0T
Audi TT MKII Quattro 3.2L
Audi TT MKII TTS 2.0T
Audi TTS MK2 (2006-2013) 2.0T
Volkswagen 337/20AE All 1.8T
Volkswagen Alltrack All 1.8T Gen3
Volkswagen Beetle All 1.8T Gen3
Volkswagen Beetle All 2.0T
Volkswagen Beetle All 2.0T Gen3
Volkswagen Beetle All 2.5L
Volkswagen Beetle All TDI
Volkswagen CC 4Motion VR6
Volkswagen CC FWD 2.0T
Volkswagen CC FWD VR6
Volkswagen EOS All 2.0T
Volkswagen EOS All 3.2L
Volkswagen Golf IV All 1.8T
Volkswagen Golf IV All 2.0
Volkswagen Golf IV All TDI
Volkswagen Golf IV All VR6 12v
Volkswagen Golf IV All VR6 24v
Volkswagen Golf R All 2.0T
Volkswagen Golf V All 2.0T
Volkswagen Golf V All 2.5
Volkswagen Golf V All TDI
Volkswagen Golf VI All 2.0T
Volkswagen Golf VI All 2.5
Volkswagen Golf VI All TDI
Volkswagen Golf VII Hatchback 1.8T Gen3
Volkswagen Golf VII Hatchback 2.0T Gen3
Volkswagen Golf VII Hatchback e-Golf
Volkswagen Golf VII Hatchback TDI
Volkswagen Golf VII Sportwagen 1.8T Gen3
Volkswagen Golf VII Sportwagen TDI
Volkswagen Golf VII R 4Motion 2.0T Gen3
Volkswagen Jetta IV All 1.8T
Volkswagen Jetta IV All 16v
Volkswagen Jetta IV All 2.0
Volkswagen Jetta IV All TDI
Volkswagen Jetta IV All VR6 12v
Volkswagen Jetta IV All VR6 24v
Volkswagen Jetta IV Wagon All
Volkswagen Jetta IV GLI All 1.8T
Volkswagen Jetta V All 2.0T
Volkswagen Jetta V All 2.5
Volkswagen Jetta V All TDI
Volkswagen Jetta VI Sedan 1.4T Hybrid
Volkswagen Jetta VI Sedan 1.8T Gen3
Volkswagen Jetta VI Sedan 2.0
Volkswagen Jetta VI Sedan 2.0T Gen3 GLI
Volkswagen Jetta VI Sedan 2.5
Volkswagen Jetta VI Sedan GLI
Volkswagen Jetta VI Sedan TDI
Volkswagen Jetta VI Sedan Facelift 1.4T
Volkswagen Jetta VI Sedan Facelift 1.4T Hybrid
Volkswagen Jetta VI Sedan Facelift 1.8T Gen3
Volkswagen Jetta VI Sedan Facelift 2.0L
Volkswagen Jetta VI Sedan Facelift 2.0T Gen3 GLI
Volkswagen Jetta VI Sedan Facelift TDI
Volkswagen Jetta VI Sportwagen 2.0T
Volkswagen Jetta VI Sportwagen 2.5
Volkswagen Jetta VI Sportwagen TDI
Volkswagen New Beetle All 1.8T
Volkswagen New Beetle All 16v
Volkswagen New Beetle All 2.0
Volkswagen New Beetle All 2.5L
Volkswagen New Beetle All TDI
Volkswagen Passat B5 4 Motion 1.8T
Volkswagen Passat B5 4 Motion V6 30v
Volkswagen Passat B5 4 Motion W8
Volkswagen Passat B5 FWD 1.8T
Volkswagen Passat B5 FWD TDI
Volkswagen Passat B5 FWD V6 30v
Volkswagen Passat B6 4 Motion 3.6L
Volkswagen Passat B6 FWD 2.0T
Volkswagen Passat B6 FWD 3.6L
Volkswagen Passat B7 FWD 1.8T Gen3
Volkswagen Passat B7 FWD 2.0T Gen3
Volkswagen R32 All All
Volkswagen R32 MKIV All 3.2
Volkswagen R32 MKV All 3.2
Volkswagen Tiguan 1 4 Motion 2.0T
Volkswagen Tiguan 1 FWD 2.0T
Volkswagen Tiguan 2 4 Motion 2.0T
Volkswagen Tiguan 2 FWD 2.0T
Volkswagen Touareg 1 All TDI
Volkswagen Touareg 1 All V6
Volkswagen Touareg 1 All V8
Volkswagen Touareg 2 All TDI
Volkswagen Touareg 2 All V10 TDI
Volkswagen Touareg 2 All V6
Volkswagen Touareg 2 All V6 TDI
Volkswagen Touareg 2 All V8
Volkswagen Touareg 3 Hybrid All
*The above product applications have been written by ECS Tuning. All warranties, product application, fitment, and performance are the responsibility of ECS Tuning. For additional information see the terms of use.

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