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Flybuster · 15-12-15, 08:17 PM

As the coolant heats up, it expands. The bottle is there to take up the the extra fluid. The level drops again as it cools. As it heats there is also a fair amount of pressure built up so never take the top off whilst the coolant is hot. It'll throw out boiling hot liquid.

15-12-15, 08:17 PM	#3
Flybuster Member Join Date: Jun 2011 Location: Tyneside Posts: 126	Re: Stupid noob question As the coolant heats up, it expands. The bottle is there to take up the the extra fluid. The level drops again as it cools. As it heats there is also a fair amount of pressure built up so never take the top off whilst the coolant is hot. It'll throw out boiling hot liquid.