Corolla 03 radiator's capacity

I'm far from a professional so I would probably wait till someone who knows more came along to take a guess but here's what I think...First off, your radiator capacity should be listed in your manual. From what I understand, in order to properly fill a radiator, you must first fill it till its topped out and then put the cap on and start the car. Let the car run long enough for the thermostat to open up and then take the cap off and fill the radiator the rest of the way up. This way the fluid is able to fill the entire system. I, like you, await a better answer from a bit more of a reputable source though.

Good advice! Most likely, the OP did not get all of the original coolant out, especially if the heater was not set on hot. When filling the radiator, the heater temperature control should be set on full hot. As far as whether the coolant mix is correct, the best thing to do would be to invest in an inexpensive coolant checker outer (less than U.S. $10.00) that looks like an eye dropper with colored balls floating inside and check the specific gravity.