How to flush the coolant system?

[Ryan Heo]

I've been on walmart. There are a coolant flusher and cleaner. I don't know what those are exactly. However I think my I30 is needed to flush or clean the coolant system because it was made 11 years ago. Would you let me know hot to do it and what different are between flush and cleaner?Thanks.

[brianw]

When car is cool...

Remove radiator cap.

Remove drain plug from radiator.

Remove both drain bolts from the engine block. (IIRC your owners' manual or the factory service manual should say where these are)

Wait for coolant to drain.

Reinstall all drain plugs.

Refill with 50/50 coolant/water mix.

Not quite sure what you're seeing at Walmart, you really don't need anything fancy to do this. If you want to be really complete you can fill it with water, run the engine for a minute to circulate it, then kill it before it gets hot, let it cool, and then drain it again, then fill it with 50/50 of coolant and water.

[Ryan Heo]

The problem is that where is the drain plugs?I have a factory service manual ,so got a picture of the position.However I can't see at all underneath my car.I have tried to find the plugs 3 times, but I couldn't. Even the radiator was taken out now. I'm still finding now.

[maxhopper]

The drain plugs are on the engine block behind where the exhaust manifold bolts to the y-pipe.

[Ryan Heo]

I found them but I think it's impossible.The rear drain plug couldn't be reached.Anyway Thanks.