 | Home > Puma (Tdci) > Coolant level when hot |
 
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| Pacha Member Since: 23 Feb 2020 Location: North Yorkshire Posts: 772   
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You only need to check the level when cold - as long as it is on or a couple of mm above the 'cold level' then all is good. Rgds.
Chris |
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26th Aug 2020 5:59pm |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 1969
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As pacha said. Coolant level is checked when cold and vehicle on level surface.
The rest is fluid dynamics. Water, and coolant is mostly water, expands when hot, so will be at a higher level when hot as compared to when cold. And that is what you are observing when you see it above the cold level on the tank. Ps. Water is one of the few things that expands when hot, yet also expands when very cold (ice). Metails etc don’t behave that way, they expand when hot but shrink when cold. That H2O is cleaver stuff  |
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26th Aug 2020 6:47pm |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 327
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Thanks.
I've never paid any attention to this in the past because as long as its at the cold level then its fine. I'm trying to troubleshoot an issue with the car getting hot and the cap hissing so just wanted to make sure that its normal for the tank to get that full and that its not cause by some kind of airlock or dodgy pressure. |
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26th Aug 2020 6:56pm |
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| Pacha Member Since: 23 Feb 2020 Location: North Yorkshire Posts: 772
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Sounds like the cap needs replacing. Rgds.
Chris |
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26th Aug 2020 7:53pm |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 327
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It was new on today!
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26th Aug 2020 7:56pm |
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| Pacha Member Since: 23 Feb 2020 Location: North Yorkshire Posts: 772
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Ah. Rgds.
Chris |
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26th Aug 2020 8:08pm |
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| ozzie1989 Member Since: 25 Feb 2009 Location: Wales Posts: 282  
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The cap has a pressure relief valve in it, so if the system is over pressure it releases it in a fairly controlled fashion rather than blowing holes in the tank or hoses etc. where possible.
If you bought a cheap cap I'd replace it, tried that myself and it's pot luck if they actually do the job properly. Yours could be faulty. The alternative is that something is pressurising the system over normal levels, e.g. exhaust gases getting into coolant via say a head gasket leak. May be worth trying: - A new(er) cap - Checking you have the right amount of antifreeze to water ratio* - Having your coolant system pressure tested * Antifreeze also raises the boiling point of the water and as such little or no antifreeze can cause issues when the engine gets hot. Now: 2010 2.4 TDCi 110 Utility Wagon Then: 2004 2.5 TD5 90 Hard Top (X-Tech Edition) |
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26th Aug 2020 9:55pm |
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| andydef90 Member Since: 09 Feb 2015 Location: yorkshire Posts: 617 
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its a puma thing mine is on its third cap as said the cap as a relief valve on it so the hissing is ok . I'm thinking about changing the expansion tank tor a aluminium one . is your new cap a original one only asking as the cheap ones on are going to be poor copies and tent not to have the valve . also are you losing any coolant at all
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27th Aug 2020 7:37am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17305 
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Make sure that you don't have air in the system at the high point, there is a bleed valve on the heater valve for this purpose.
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27th Aug 2020 8:20am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2625  
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Treat the coolant cap as a service item, I replace mine every year, as it will inevitably leak
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2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged 
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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27th Aug 2020 9:48am |
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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 1969
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. If the engine is getting over hot, and the cap has been venting a little coolant I read in another thread that this can generate air in the system, so another good tip from Blackwolf . Also here is a potential alternative to a standard landrover cap. https://www.defender2.net/forum/post710243.html#710243 and here in more detail https://www.defender2.net/forum/topic44373...=iveco+cap |
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27th Aug 2020 1:31pm |
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