Squeeze the hoses they should me firm and not bulge, you can also after you flush it, take the cap off, and then you will see it bubbles up (air coming out) as it warms up, it will push the air out, when it stops the bubbling the air is out and replace the cap, don't forget to put antifreeze back in to it 50% antifreeze, 50% water, there's 2 types, long term (about 5 years with inhibiter's in it) and the other lasts about 2 years, you don't ever have to change the stuff but the corrosion inhibitors do stop working at there best after that time, red is the 5 year stuff and the yellow one is the 2 year (in general that is, check the label) get concentrate too, its a lot cheaper and mix it yourself, you don't have to mix it as such just add as you think its about 50%
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