Table of Contents

Parts List

• Upper Radiator Hose

• Lower Radiator Hose

• (4) Hose Clamps

Tools Needed

• Phillips head screwdriver 

• Flathead screwdriver

• 3/8" ratchet

• 3/8" 10mm socket

• 3/8" 12mm socket 

• 3/8" 8mm socket 

• 3/8" 12" extension

• 3/8" 6" extension

Stock Radiator Removal

1. Put your car on a safe level area and allow it to cool down.  When in doubt let it sit longer, as coolant can hold heat for quite some time and severe burns are possible if you don't take your time.
   
   

2. Using a flat-blade screwdriver loosen the plastic clips retaining the air inlet scoop and then remove them using a trim tool.  Once both are taken out remove the whole assembly from your engine bay.
   
   

   
   
   
   

3. Now is a good time to remove the coolant reservoir cap above the head of the engine.  This will help the coolant drain out a little bit more easily.
   
   

4. Remove the vehicle's Undertray.
   VA WRX Undertray Removal
   STI Undertray Removal
   VB WRX Undertray Removal
   
   
   

5. Next position a drain pan or container to collect the coolant and remove the drain plug using a phillips head screwdriver
   
   

   
   
   
   

6. Using the drain plug can take a long time, however it's generally the cleanest way to do it.  If you're impatient (or it's done draining) you can start on the lower radiator hose.  Using needlenose pliers squeeze the spring clamp together until it locks in place fully expanded.  A good way to get the hose loose at this point is to gently try twisting it back and forth to break the seal between the lower hose and the radiator.  The stock hose clamp is small enough that it can be difficult to remove with the lower hose so oftentimes it's easier to hold the clamp over the radiator fitting while pulling the lower hose free.  Even if the radiator is completely drained more coolant will come out at this point since the hose will also drain additional coolant from the engine block as well.  
   
   

   
   
   
   

7. Use the same procedure to remove it from the opposite end.  This is also a good time to replace the thermostat if needed since the whole system is drained.
   
   

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8. Use your pliers again to remove the clamps and pull the upper radiator hose free from both ends.