Sa Altima kita naman ang block drain plug... socket wrench lang katapat.

There's another way of doing it naman if di mo maabot yung plug. Warm up the car until the thermostat opens, tapos make sure na di gaano kainit, remove the upper radiator hose while doing the flush... daming ibubuga yung waterpump kung rinev mo konti.

Best to do it with ample water flowing through para di matuyuan ang system...

Did that sa old benz ko dati grabe ang dumi...

Drained the radiator water 2x na and i used a little radiator flush (luma na kasi talaga oto), nung malinis na, i removed the radiator hose and reflushed, grabe, mas madumi pa sa 1st drain yung lumabas sa block hehe.