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DIY coolant replace + flush
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<blockquote data-quote="drexchan" data-source="post: 1063694144" data-attributes="member: 6936"><p>I think this is more applicable to intake air temperature. Colder engine coolant doesn't translate to better performance as you've described later. </p><p></p><p></p><p>I hope that you didn't actually let the engine idle for that long without the radiator being capped back. There's a purpose to have the radiator cap (other than allowing your to flush and fill the radiator). </p><p></p><p>It's to sustain a higher pressure than atmosphere inside the cooling system. Like a pressure cooker, this will increase the boiling point, thus preventing bubble build-up inside the cooling system at the working temperature of the thermostat. (Steam bubble in its gaseous state is not a good medium for heat exchanging).</p><p></p><p>The reason why it takes so long for the coolant to stop bubbling is that - it may never stop if you keep the radiator cap away.</p></blockquote><p></p>
[QUOTE="drexchan, post: 1063694144, member: 6936"] I think this is more applicable to intake air temperature. Colder engine coolant doesn't translate to better performance as you've described later. I hope that you didn't actually let the engine idle for that long without the radiator being capped back. There's a purpose to have the radiator cap (other than allowing your to flush and fill the radiator). It's to sustain a higher pressure than atmosphere inside the cooling system. Like a pressure cooker, this will increase the boiling point, thus preventing bubble build-up inside the cooling system at the working temperature of the thermostat. (Steam bubble in its gaseous state is not a good medium for heat exchanging). The reason why it takes so long for the coolant to stop bubbling is that - it may never stop if you keep the radiator cap away. [/QUOTE]
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