How the hell can i get all the freakin coolant out!

The heater hoses and heater core will probably hold a litre or two, maybe more..

 

Need to take out knock sensors to completely drain it

 

I have never drained any of my cars coolants completely, never had a single problem. What for? Just flush it with the hose until you get no more colour and put coolant in it.

 

He did that.

 

If you're really OCD about it you can hookup compressed air to one of the hoses and try blast it all through, however, I have been told this can cause more damage than it fixes.

If you have run the hose till it comes out clear, then you have done it right anyways.

 

I've usually drained "most" of the coolant out by taking thermostat out, then filling with water, run engine for about 5 minutes, with heater on high of course, then drop bottom hose. Repeat three or four times, usually water comes out pretty clear. Put new thermostat and gasket in. I figure the system takes 12 litres, so a 5 litre bottle 50% mix, straight into radiator, then a 1 litre bottle 50% mix in the overflow bottle. Done that to both cars on a bi annual basis, and never had a problem.

And make sure you bleed system after changing coolant.

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Oops. My bad. Didn't read it properly.

 

Never put compressed air in the system. Yea it will take all the water out, but any hard and sharp debris in the system will be forced flying out at high speeds which can break/cut the seals easily.

 

Yes, sorry, bad explanation.

Concentrate into radiator, top up with water, plus the water left in equals 50% mix. I think I know what I meant. :doh::doh: