This radiator coolant overflow tank has been redesigned to fix issues with the original factory design.

Specifications:

  • Brand New Radiator Overflow Bottle
  • Commonly called "Coolant Overflow Tank" or "Reservoir"
  • Includes Cap
  • Replaces dealer part numbers: 3B0-121-321, 1K0-121-407-A, 3B0121321, 1K0121407A
  • Strengthened and redesigned in the vulnerable areas of failure
  • Replacement for originals that are cracked or broken
  • Plastic construction

Now you can buy a high quality coolant reservoir that is built to strict quality control standards. Replace your broken or cracked one now with this great fitting part.

Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser. Please keep your invoice for proof of this warranty.

  1. step : Removing the Coolant Bottle (0:40)
    • Remove the three 10mm bolts from the bottle
    • Disconnect the coolant sensor harness
    • Remove the two T25 Torx screws
    • Push the teeth and slide the hose clamp back with a pair of pliers
    • Disconnect the coolant hose
    • Push the teeth and slide the hose clamp back with a pair of pliers
    • Disconnect the lower coolant hose
  2. step : Installing the New Coolant Bottle (2:24)
    • Connect the lower coolant hose
    • Slide the hose clamp up into place
    • Connect the upper coolant hose
    • Slide the hose clamp up into place
    • Insert the coolant bottle into place
    • Tighten the two T25 Torx screws
    • Connect the coolant sensor harness
    • Tighten the three 10mm bolts to the bottle

Tools needed for replacement:

    Pliers, Cutters & misc Wrenches

  • Needle nose pliers

  • Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Sockets - Metric

  • 10mm Socket

  • Torx Drivers & Sockets

  • T25 Torx Socket
  • T25 Torx Driver

5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
2
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0
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Radiator Overflow
Prompt shipping. Item is solid and probably better than original.
February 27, 2017
Purchased
1 year ago
Great Part
Sturdy, Fits Perfectly, Arrived Quickly. As good or better than the OEM part
January 23, 2017
Purchased
1 year ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 1 question Browse 1 question and 1 answer
I didn't see the Tiguan 2009 as one of the vehicles this reservoir fits. Will it work for the Tiguan 2009?
Karen d on May 27, 2017
BEST ANSWER: Yes, this will fit the 2009 Tiguan.

How-to Video:

(04:01 min)

Tools List:

    Pliers, Cutters & misc Wrenches

  • Needle nose pliers

  • Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Sockets - Metric

  • 10mm Socket

  • Torx Drivers & Sockets

  • T25 Torx Socket
  • T25 Torx Driver




Vehicle Fit

  • 2006-2013 Audi A3 Radiator Overflow Bottle with Cap
  • 2006-2013 Audi A3 Quattro Radiator Overflow Bottle with Cap
  • 2008-2011 Audi TT Radiator Overflow Bottle with Cap
  • 2012-2013 Audi TT Radiator Overflow Bottle with Cap L4 2.0L
  • 2008-2011 Audi TT Quattro Radiator Overflow Bottle with Cap
  • 2012-2013 Audi TT Quattro Radiator Overflow Bottle with Cap L4 2.0L
  • 2012-2014 VW Beetle Radiator Overflow Bottle with Cap
  • 2009-2013 VW CC Radiator Overflow Bottle with Cap
  • 2007-2013 VW Eos Radiator Overflow Bottle with Cap
  • 2006-2009 VW GTI Radiator Overflow Bottle with Cap
  • 2010-2013 VW Golf Radiator Overflow Bottle with Cap
  • 2005-2009 VW Jetta Radiator Overflow Bottle with Cap (8th Vin Digit K)
  • 2010-2011 VW Jetta Radiator Overflow Bottle with Cap
  • 2012-2013 VW Jetta Radiator Overflow Bottle with Cap
  • 2006-2010 VW Passat Radiator Overflow Bottle with Cap
  • 2012-2014 VW Passat Radiator Overflow Bottle with Cap
  • 2006-2009 VW Rabbit Radiator Overflow Bottle with Cap
  • 2009-2013 VW Tiguan Radiator Overflow Bottle with Cap
Part #: 1AROB00209

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