Anytime as long as you are adding it to the reservoir. Never remove the radiator cap when the engine is hot.
It is better to add premixed anti-freeze.
You should be running anti-freeze year round as it is a coolant also, hence the name "Anti-freeze/Coolant"
Just add it in a ratio recommended by the anti-freeze manufacturer directly to the reservoir. If you still have a low coolant light once it is at the MAX line, you can safely add more for a little till the light goes off.
anti freeze
No!!!! Regular Anti-Freeze is not a combustible liquid! Gasoline already has a "gas line anti-freeze" added to it in cold climates. In extremely cold areas, one small bottle of "gas line Anti-freeze" purchased at an Auto Parts store will help.
Yes it can freeze.
Yes, anti-freeze can kill you if you drink it.
Empty the radiator - and re-fill it ! Car anti-freeze is added to the water in the radiator so, if you drain it and re-fill it, you can add a fresh quantity of anti-freeze into the radiator filler hole.
Low engine coolant or ineffective coolant. Add or replace anti freeze
You can use any SAE certified anti-freeze in your 2006 Toyota. The anti-freeze should have a minimum temperature rating of -25 degrees Fahrenheit and 120 degrees Fahrenheit.
You should add a 50/50 mix of anti-freeze and water.
It should be 50% WATER, 50% ANTI-FREEZE, which should put your protection at 40 degrees below zero Fahrenheit. If you add to much anti-freeze, you may have problems with boil over later in the summer.