We just purchased a 2006 Isuzu NPR with the 5.2L 4KH1-TC engine. I am changing all of the fluids and filters (it was purchased at auction with no service records to be found, so I am not sure how long it has had the current fluids). I want to change it over to red ELC coolant (it has green in it now) and therefore need to drain the coolant system as well as I can before I flush it with water. I see a drain on the very bottom of the radiator, but cannot find a drain plug on the block anywhere. Does this engine just drain through the radiator, or does it have a drain plug that I am missing?
Hurst
Hurst
