GC17xx, coolant change

[GeneV]

Guys, reading the manual, mine says the drain tube drains both radiator and block, so I'm curious why people here are advocating draining the block separately. Is it to squeeze every last bit of coolant that be stuck in the recesses of the block? If that's the case, ain't it kinda overkill?

I did mine yesterday, I didn't unscrew the plug on the block. I just drained via the tube, then flushed with distilled water, ran that a bit, drained again, and filled it all up with new coolant. Obviously did the overflow reservoir as well.

 

[ray66v]

Guys, reading the manual, mine says the drain tube drains both radiator and block, so I'm curious why people here are advocating draining the block separately. Is it to squeeze every last bit of coolant that be stuck in the recesses of the block? If that's the case, ain't it kinda overkill?

I did mine yesterday, I didn't unscrew the plug on the block. I just drained via the tube, then flushed with distilled water, ran that a bit, drained again, and filled it all up with new coolant. Obviously did the overflow reservoir as well.

If you are changing it on a regular basis, any residual amount is diluted. So, it's no big deal.

Changing coolant every two years, for most people is overkill.

Sometimes the "feel good" factor is worth it to people.

 

[def38]

Distilled water would be the best

Why? Distilled or deionized water is unnecessary in your radiator. Once you ad coolant, your adding various solubles to the cooling system in order to keep the metals in your engine happy. Flush with a garden hose and ad the appropriate coolant mixture. If you have extremely hard water, you might want to use store bought water but only in extreme cases.