I had the same problem. I was driving down the road and all of a sudden the engine quit. It turned out to be the timing belt had broken in mine, timing belts should be replaced every xx,xxx miles or 5 years whichever is sooner, since this is called a zero clearance engine (no indents in the pistons for valves) it also bent 6 valves.
The fuel pump on a 2000 nubira is under the back seat on the passenger side.
A buffer solution.
How do you flush the transmission fuel from a 2000 Daewoo Nubira
In 2000 Daewoo Nubira the ECM is located on the front passenger side wall by the front passenger right foot.
I have a 2000 Daewoo Nubira and I had the control arm replaced and it fixed the problem.
behind the alternator
here is the link to the nubira service manual http://chevy.mrmax.dp.ua/EN/GMDE_TIS_START.html
on the exhuast header pipes
2000 Nubira, same problem, no water flow from block to heater, core not blocked, runs fine????????????
every 60,000 miles
you cant its all done electronically sorry mate !!
Sudden Strike happened in 2000.