It was time to replace the coolant in the old IS and with 170K miles on the clock,
I thought I might as well replace the radiator hoses while I'm at it.
Jack the car up and support it with jack stands
And this is why you should always use jack stands:
I'm usually lazy and use a jack stand to support one side of the car and
then just use the jack itself to support the other side.
This piece of crap "Duralast" jack didn't last at all. I guess
there's a leak or something so it slowly lost pressure and lowered itself.
Luckily I placed a jack stand next to the jack where it could
catch the car in case the jack failed.
Remove the plastic cover under the engine
There's 10+ 10 mm screws and one plastic clip holding it in place.
This thing is annoying as hell and I'm tempted to leave it off every time
I'm down there working on something but I always end up putting it back.
Drain the radiator
The radiator drain plug is this white plastic knob on the driver's side.
It takes forever to drain so I just removed the plug altogether.
To help get it all out, I also jacked up the rear of the car.
Since our cars are RWD and the e-brake only locks the rear wheels,
I placed a wheel chock at the front wheel just to be safe.
Flush the radiator with distilled water
Close the radiator drain plug, lower the car, and fill the radiator with distilled water.
I ran it for about 10 minutes (with the heater on full blast) then
let it cool down and drained the radiator again.
Replace radiator hoses
The upper hose is super easy. Just remove the hose clamps and
twist and pull the hose and it comes right off.
Pic of the new hose next to the old hose:
The OEM hose has a white mark at the end. When installing,
simply align it with the notch on the radiator:
The lower radiator hose is pretty straight forward as well. It was easier for me to remove the
engine side of the hose from the top of the engine compartment.
Similar to the upper radiator hose, the lower hose
also has markings on it that you align to the notches.
Fill radiator with antifreeze coolant
Mix 50/50 antifreeze coolant/distilled water, fill the
radiator and top off the reservior and you're all done!