[j cat]

flush out the engine and the radiator ... take off the engine heater hoses then flush out ..
then the distilled water 50% and the coolant 50% ....
I was in my below zero F 65% coolant and the distilled water 35%..

 

[j cat]

1997 GMC Sierra.
5.7L engine.
Automatic transmission.
2wd.
170,xxx miles.

the 40psi oil ....idle ...
in todays world the oil is changed the specs.. I was over the 20 yrs old vehicles are the 2 oz of the sn plus additive in the engine oil ...
also the dexron VI [6] transmission fluid is updated in 2006 ....dexron 3 is GM dumped it ..