If there's no leak, an overheat is caused by a problem with coolant level, coolant circulation, or heat transfer. Fill the coolant level. If the problem recurs within a month, it was something other than low level. Circulation problems are caused by clogged radiators, bad water pumps, non-functioning thermostats.
http://pdftown.com/2000-2002-Toyota-Echo-Service-Manual.html
The 2002 Toyota Echo OBD 2 port is under driver side dash next to kick panel
For my 2002 Echo it is 3.7 Liters with a filter change.
3.6 liters
To flush the coolant in a 2002 Toyota Echo you will need to drain it first. Flush with fresh water and then refill with coolant and distilled water.
See related link.
i have a 2001 and it gets about 39-42 mpg
See related link.
http://groups.msn.com/Sorensonbrian/frontbrakepads2002.msnw
No
manual recommends 5w and 10w
11.9 Gallons