COBB Silicone Radiator Hoses for Subaru
Silicone Radiator Hoses for Subaru
Congratulations on your purchase of the COBB Tuning Silicone Radiator Hose Kit! 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.
B22400
Subaru Wrx 2008-2014
Subaru WRX STI 2008-2019
B43400
Subaru Wrx 2015-2021
B46410
Subaru Wrx 2022+
Table of Contents
Parts List
- Upper Radiator Hose
- Lower Radiator Hose
- (4) Hose Clamps
Tools Needed
Bleed Cooling System
- With everything installed head back up top and start filling up the radiator slowly, make sure to keep checking for leaks as you go and adjust hoses/tighten as needed.
- Once the radiator is filled up squeeze the hoses to try and get rid of as many air bubbles as possible, be careful as squeezing too hard too quickly can get coolant all over your engine bay.
- With as many of the air bubbles removed as you can go ahead and put the radiator cap back on. Keep in mind that the radiator cap and coolant reservoir cap typically look very similar, however the reservoir cap will be rated at a lower pressure so when in doubt refer to the stamped numbers that refer to the pressure rating in BAR.
- On the STI, head up to the coolant reservoir and begin to fill it up from there.
- On the WRX vehicles you'll just fill it straight from the radiator.
- Now it's time to bleed the coolant. This is an important step and can get a little bit time consuming, however any pockets of air can cause issues with overheating or incorrect coolant temperature settings.
- While not necessary, coolant bleeding funnel like this one can make things a whole lot easier as they come with fittings to mount directly to the cap and allow the system to bleed and fill itself at the same time.
Keep in mind that any coolant in the funnel will get just as hot as the rest of the coolant in the engine so use caution to avoid burns. - With the system full turn on the vehicle and crank up the heater all the way. By having the heater on the coolant can circulate through the heater core which will remove air bubbles from that portion of the system. Make sure to keep an eye on your coolant levels at the tank or in the funnel so that the car doesn't add any more bubbles into the system.
- Once the coolant stops bubbling you're all done with the bleeding! This can take a while (it took around 30 minutes on our car). While it's bleeding make sure to keep an eye on the coolant temperature in order to make sure your car isn't overheating and that the fans are cycling on and off properly.
While idling the radiator will got very hot quickly, be careful to avoid burns. - Place the plug securely down in the funnel and remove it from the car. Put remaining coolant back in the bottle.
- Reinstall the Coolant reservoir cap.
- After the car cools down again it's time to go ahead and re-install the skid tray
- Go out and enjoy!
Links
CSF7042 - CSF 2-Row Subaru Aluminum Radiator
800620 - COBB 1.1 Bar Coolant Reservoir Cap
COBB Product Install Instructions for Subaru Vehicles
Main Installation Instruction Repository for Subaru Parts
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