800655 - GR Coolant Overflow Reservoir

Owned by Brandyn Mowat
Last updated: Jun 02, 2022

800655 – Subaru GR Coolant overflow Tank

Subaru Impreza WRX, WRX STI 2008 - 2014




Congratulations on your purchase of the COBB Tuning GR Coolant Reservoir! The following instructions will assist you through the installation process. Please read them BEFORE beginning the install to familiarize yourself with the steps and tools needed. If you feel you cannot properly perform this installation, we HIGHLY recommend you take the vehicle to a qualified and experienced automotive technician.



Table of Contents



Parts List

 Subaru GR Coolant Reservoir Assembly

 GR Coolant Reservoir Bracket

 Coolant Overflow Cap

 Washer Fluid Fill Adapter

 Washer Fluid Fill Hose

 Washer Fluid Fill Cap

 Aluminum Mounting Pin Adapter

 Overflow Cap O-Ring

 (2) m6x1.0x10 Flat Head Screws

 m6x1.0x16 Stainless Flange Bolt

 m6x1.0x10 Stainless Flange Bolt


 6mm Lock Washer

 5/8" Rubber Grommet

 6mm ID Silicone Hose

Tools Needed

Sockets

3/8"

  • 3/8" ratchet
  • 3/8" 12" extension
  • 3/8" 6" extension
  • 3/8" 10mm socket


Wrenches

  • 10mm combination wrench


Section 1

  1. Park your car in a flat, level area and allow it to cool down properly.

  2. Using a 10mm wrench, remove the negative terminal of the battery.

  3. As long as things are cooled down and the radiator hoses easily squeeze and don't feel as though there's pressure you should be okay to start.

  4. Pull the hose gently out of the coolant overflow tank, most of the fluid should drain back into the tank.  If not lift the end of the hose upward to get it to drain back into the radiator.






  5. On the side of the overflow tank that is towards the headlight (not the radiator) you'll notice the end of the tank is underneath a small tab.  press this in to release the coolant tank and rotate it counter clockwise to free it from the fan shroud.  you can then lift up and remove it from the car.




  6. You'll want to set this somewhere safe and upright so the coolant inside doesn't spill.  Don't get rid of it as we'll use it later.

  7. Using a phillips screwdriver undo the clip for the washer fluid fill spout.  In some cases if the center just spins in place without backing out you'll need to use a trim tool or screwdriver to gently lift the center of the tab out.




  8. Grab the fill tube and gently lift upward.  It should release from the lower half of the tank.






Washer Fluid Fill Tube Assembly

  1. Remove the o-ring from the stock fill tube and install it around the COBB fill tube adapter.








  2. Gently push this into the washer fluid tank.




  3. You can now install the washer fluid fill tube onto that fitting.  Make sure the writing with the COBB logo are at the top.