Bought a used 2013 Corolla with 91K. Trans fluid was pretty dark, so I decided to do a complete change rather than just drain and fill with 3-4 quarts. Drained the pan and pulled it off. There was probably a good teaspoon of gray metal sludge on the two pan magnets, but no big pieces. I read that this car has a screen not a filter, but mine had a felt filter in it, and the new WIX filter had the same thing. Put the pan back on and put a gallon of Valvoline MAX LIFE full synthetic ATF in it.
If you look down at the front of the transmission you can see two rubber hoses coming off it for the cooler lines. The hose that comes straight up and makes a quick 90 degree bend is the return line. Trace that one out to the metal hard line and pull off. You can just leave that hose hanging, and plug a few feet of 3/8" clear PVC tubing from home depot onto the metal hard line. Put the other end into a clear one gallon jug. You will be pumping fluid out the transmission, through the cooler and into the jug.
I started it up and dirty fluid started to flow into the jug. It did not go too fast to handle myself, maybe about a quart every 10- 15 seconds. I had plenty of time to get out of the car and watch the fluid fill the jug. When it got to about three quarts full I shut off the engine and poured another 3 quarts of new fluid into the trans. Also sat in the car while it was pumping and cycled the gear shifter through all the positions.
I ran 4 gallons through it to get it coming out looking pretty clean. I overfilled it and had to crack the drain plug a turn to drain off half a quart.
I heard stories of people changing dirty fluid and making their transmissions slip, but mine worked fine before and after the fluid swap so hopefully I can get another 100 - 200K out of this tranny. Will do a drain plug drop every other engine oil change to avoid another flush.
If you look down at the front of the transmission you can see two rubber hoses coming off it for the cooler lines. The hose that comes straight up and makes a quick 90 degree bend is the return line. Trace that one out to the metal hard line and pull off. You can just leave that hose hanging, and plug a few feet of 3/8" clear PVC tubing from home depot onto the metal hard line. Put the other end into a clear one gallon jug. You will be pumping fluid out the transmission, through the cooler and into the jug.
I started it up and dirty fluid started to flow into the jug. It did not go too fast to handle myself, maybe about a quart every 10- 15 seconds. I had plenty of time to get out of the car and watch the fluid fill the jug. When it got to about three quarts full I shut off the engine and poured another 3 quarts of new fluid into the trans. Also sat in the car while it was pumping and cycled the gear shifter through all the positions.
I ran 4 gallons through it to get it coming out looking pretty clean. I overfilled it and had to crack the drain plug a turn to drain off half a quart.
I heard stories of people changing dirty fluid and making their transmissions slip, but mine worked fine before and after the fluid swap so hopefully I can get another 100 - 200K out of this tranny. Will do a drain plug drop every other engine oil change to avoid another flush.