Our coolant overflow bottles are some of the highest quality replacements on the market! This radiator coolant overflow tank has been designed to replace the original design.

Specifications:

  • Direct replacement for originals that are cracked or broken
  • Replaces dealer part number: 1H0 121 407A, 1H0121407A
  • Strengthened and redesigned in the vulnerable areas of failure
  • Plastic construction
  • Commonly called "Coolant Overflow Tank or Reservoir, or Expansion Tank" by Volkswagen
  • Fits models with 4 Cylinder Engines only
    • Does NOT fit models with 6 Cylinder Engines

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 radiator overflow bottle.

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)
    • Pull off the coolant bottle shield by hand
    • Disconnect the coolant bottle wiring harness
    • Loosen the upper coolant bottle hose clamp with pliers
    • Pull off the upper coolant bottle hose
    • Remove the two 10mm bolts from the coolant bottle
    • Lift up the coolant bottle
    • Have a drain pan ready
    • Loosen the lower coolant bottle hose clamp with pliers
    • Pull off the lower coolant bottle hose
  2. step : Installing the Coolant Bottle (2:50)
    • Put the coolant bottle into place
    • Insert the two 10mm bolts into the coolant bottle
    • Push on the coolant bottle sleeve
    • Connect the lower coolant bottle hose
    • Tighten the lower coolant bottle hose clamp
    • Push the upper coolant hose on
    • Tighten the upper coolant hose clamp

Tools needed for replacement:

    General Tools

  • Drain Pan

  • Pliers, Cutters & misc Wrenches

  • Slip-Joint Pliers

  • Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Sockets - Metric

  • 10mm Socket

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How-to Video:

(04:12 min)

Tools List:

    General Tools

  • Drain Pan

  • Pliers, Cutters & misc Wrenches

  • Slip-Joint Pliers

  • Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Sockets - Metric

  • 10mm Socket



This part replaces:

  • OE # 1H0121407A

Vehicle Fit

  • 1995-2002 VW Cabrio Radiator Overflow Bottle
  • 1990-1992 VW Corrado Radiator Overflow Bottle L4 1.8L Supercharged
  • 1989 VW Golf Radiator Overflow Bottle (Built After 10/89 Production Date)
  • 1990-1998 VW Golf Radiator Overflow Bottle L4 2.0L
  • 1990-1992 VW Golf Radiator Overflow Bottle L4 1.8L
  • 1997-1998 VW Golf Radiator Overflow Bottle L4 1.9L Diesel
  • 1990-1997 VW Jetta Radiator Overflow Bottle L4 2.0L
  • 1990-1992 VW Jetta Radiator Overflow Bottle L4 1.8L
  • 1990-1992 VW Jetta Radiator Overflow Bottle L4 1.6L Diesel
  • 1998 VW Jetta Radiator Overflow Bottle L4 1.9L Diesel
  • 1990-1996 VW Passat Radiator Overflow Bottle L4 2.0L
  • 1996-1997 VW Passat Radiator Overflow Bottle L4 1.9L Diesel
Only 2 left in stock
Part #: 1AROB00037

Ships Same Day for orders placed by 4 P.M. ET

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