800650 - Coolant Overflow Reservoir Install Instructions



 COBB Overflow Reservoir



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

Part List

  • Coolant Overflow Tank
  • Coolant Overflow Tank Bracket
  • Coolant Overflow Bracket Bottom Bung
  • Coolant Bracket Spacer
  • M6x25 Flange Head Bolt (1)
  • M6x12 Flange Head Bolt (3)

Tools Needed

  • 10mm Socket or Wrench

 Removal/ Installation of Coolant Overflow Reservoir

  1. Remove the coolant overflow line from the top of the tank.
  2. Now press on the black tab on the right side of the radiator shroud (yellow arrow) to release the reservoir from the shroud. Push the reservoir towards the engine (red arrow.) Now lift upward to remove it from the car.

  3. It's now time to assemble the new coolant reservoir. Bolt the reservoir to the bracket with the M6x12 flange heads bolts provided (yellow arrows.) Bolt the coolant overflow bracket bottom bung to the bracket using an M6x12 flange head bolt (red arrow.) Tighten all the bolts with a 10mm socket or wrench.  Make sure that the reservoir is bolted to the correct side of the bracket.


  4. Remove the reservoir cap from the factory overflow tank and install it on the new tank.  

  5. To install the tank in the car, place the bottom bung of the bracket into the mounting hole on the radiator shroud. Bolt the top of the bracket to the radiator using the provided M6x25 flange head bolt. Make sure to install the 1/4"x3/4" spacer between the bracket and radiator.  Tighten the bolt with a 10mm socket or wrench.


  6. Now slide the tube back into the top of the overflow tank.  The end of the tube should be about 1/4" away from the bottom of the tank.  Fill the reservoir approximately half full with coolant. Enjoy your new COBB Coolant Overflow Reservoir!

Contact Us:

COBB Customer Support

Web Support and Tech Articles: COBB Tuning Customer Support Center

Email: support@cobbtuning.com

Phone support available 9am to 6pm Monday-Thursday. 9am to 4pm Friday (CST)


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