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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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Coolant level questionViews : 1255 Replies : 26Users Viewing This Thread : |
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#1 |
Senior Member
Last Online: May 21st, 2024 18:43
Join Date: Mar 2017
Location: Aylesford, SarFeast
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I have a B4204t2, when i check the coolant level 1st thing when cold the level is bang on the max mark, when i drive her till hot the level drops to just on the min mark, i leave her for several hrs and the level returns to bang on the max mark, is this a turbo thing? I ask this as my B4204s the level stays the same hot or cold, cheers for any advice.
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#2 |
Premier Member
Last Online: Jan 3rd, 2024 14:43
Join Date: Feb 2012
Location: Toronto Canada
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Mine does the same thing (not sure if it goes all the way down to min but the level definitely goes down). It might just be that the pipes start to flex a bit as the engine heats up (and as the car gets older). I do not believe that it is turbo related. You will note that if you let the car sit for a bit (say 45min) and then CAREFULLY take the coolant cap off using a big rag for extra protection that the fluid will very likely bounce back to the high mark. You will also hear some pressure being released. It's just some minor pressure build up is all.
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#3 |
Senior Member
Last Online: May 21st, 2024 18:43
Join Date: Mar 2017
Location: Aylesford, SarFeast
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Hello Pierre, cheers for that, i only thought it turbo related as my S stays the same level which obviously is not a turbo, and as you described, my level after 30 mins, taking off expansion lid returns to the correct level with a hiss, once again cheers.
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#4 |
Member
Last Online: Aug 19th, 2018 12:57
Join Date: Aug 2016
Location: heers
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As the temp goos up you have more pressure on your water. Water under pressure boils at higher temperature so the coolant water does not boil around 100° C but at a much higher t° so it will not boil out the tank (radiator)and the cold level regains normal as you would not lose any water.
Last edited by loely; Jun 19th, 2017 at 16:59. |
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#5 |
Senior Member
Last Online: May 21st, 2024 18:43
Join Date: Mar 2017
Location: Aylesford, SarFeast
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Cheers loely, I learn something new everyday, just have never noticed this before, once again thanks.
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#6 |
Premier Member
Last Online: Jun 18th, 2024 21:33
Join Date: Apr 2013
Location: Plymouth
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Hi
I would imagine there is a small air pocket somewhere in the coolant system. As the engine warms up the coolant will expand, and as there is some air in the system the water will expand into that air pocket and the level in the reservoir will fall. If there are no air pockets in the coolant system the coolant will then only be able to expand into the coolant reservoir(expansion vessel) and the level will rise. Iain Last edited by IainG; Jun 19th, 2017 at 19:58. |
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