843615 - Air/Oil Separator Subaru VA WRX
Subaru WRX 2015 - 2021
Congratulations on your purchase of the COBB Tuning Air Oil Separator! 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.
When installing the hoses and lines to and from the COBB Air Oil Separator, take special care to route them away from any sources of heat, ensure that they are free of kinks or obstructions, and secure them properly with zip ties to prevent movement and chafing. Additionally keep in mind that the engine will move slightly so leave a small amount of play in the lines where it goes up to the AOS to allow for some movement without causing damage or stress on the lines.
15-16 modules have a power steering control module in this location. For 17-18 models you won't have to tackle the wiring or control unit, however the black metal bracket will still need to be removed. |
On the rear passenger's side (USDM) of the vehicle's engine bay. Locate this control module. Carefully disconnect the various connectors on it.
The wires going to the control module are designed to move a significant amount of current. You MUST disconnect the battery prior to removing these connectors or risk damage to yourself or the vehicle. |
Reference Fig.
Reference Fig.
Reference Fig.
The back of the AOS now comes with this convenient bleeder screw. With the car cold but running, use a 1/8" allen wrench to remove the o-ringed bolt. The fitting should allow coolant and air to come out of the weep hole. Do this until no more air comes out and then re-install the plug hand tight. Over Tightening may cause damage to the sealing o-ring and cause a leak later on.
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COBB Product Install Instructions for Subaru Vehicles
Main Installation Instruction Repository for Subaru Parts