Step 1: …continued… Get the coolant draining
- While draining still, work on something else — remove your coolant overflow tank (white plastic) from the car by unfastening the 2 screws and disconnecting the hose from the black hard line attached to the top of the radiator. Set this stuff out of the way with your plastic undertray. A tiny bit of coolant will drip from the hard line.
- In fact, if you want to do it now, you can remove the hard line from the radiator, as you’ll have to take it off sooner or later to attach to the new one. There are 2 10mm screws to remove. Set the hard line aside someplace clean.
- When your two left small hoses are done draining the reservoir, move your drain/catch pan underneath the lower radiator hose where it attaches to the engine block (black hose on the driver side, about 1.5″ diameter).
- You should be able to remove the top radiator hose at this point without any significant coolant spilling. Go ahead and do that to get it out of the way.
- Unfasten the hose clamp on the block end of the lower radiator hose. Check your drain/catch pan one last time, and (from the top of the engine bay) reach down and disconnect the lower radiator hose from the engine.
- You will let it drain like this for at least a half hour. Feel free to take this time to remove the upper radiator mounts and set them aside with their screws. This will allow you to shift the radiator around a little bit to help drain it. When I finally removed my radiator, it had about 1 ounce left in it. You may want to aim for that.
- When you think you’re done draining, tuck the block end of the lower radiator hose upward into the fan area so it stays put.





2 Comments
Hey man great write-up! Good thing I found this before starting the same job this weekend. Looks like we have the same radiator (Fluidyne), what size bolts do I need to for this installation? I’m replacing my radiator with the Fluidyne since the stock one leaked.
NASIOC User Name: VoltesV
Thanks…..Ian
Great write up! I have upgraded my TS radiator to a WRX radiator. One thing about Subaru is the fan starts at only 95oC which could be a bit late. Also the thermostat opens at 80+oC and is partially opened even at 95oC.
I have replaced the original thermstat using an equivalent one used on a Renault. It opens very early at 70oC and is fully opened at hot. This enhance the water flow and provides better cooling.
The engine now runs much cooler , more stable and provides more torque even on a very hot day. If you are going to get your hands dirty, do consider replacing the thermostat.
One Trackback
[...] all are useful. I won’t do oil or tranny changes as those should be easy enough. Coolant: Subaru WRX Cooling System Upgrade Spark Plugs Spark Plug Changing - Instructions - ScoobyMods Fuel Filter Fuel filter replacement - [...]