 | Home > Puma (Tdci) > Coolant cap leak |
 
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324  
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Fit a better cap:
 Click image to enlarge More details here: https://www.defender2.net/forum/post710243.html#710243 Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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11th Jul 2020 2:49pm |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 327
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Thanks...Think I might get that!
Would a leak make my temperature gauge intermittently go up? It now seems to occasionally do this but then goes back to normal. Also accompanied by momentary loss of power!? |
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11th Jul 2020 6:20pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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Hmm, that may warrant a bit of further investigation beyond just fitting a new cap. How much water have you lost? If it's enough to cause high engine temps then there could be a more significant underlying problem. It's unlikely to be intermittent, though. Are you topping it up between incidents or is it just an intermittent problem? If the latter then it may be an issue with the water temp sensor rather than something more drastic.
The loss of power sounds like a symptom of the indicated high temperature. I believe that the engine goes into a restricted performance mode if high temps are detected as a sort of self-preservation measure. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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11th Jul 2020 11:09pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8145  
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the gauge going to the top could be electrical fault and that gives loss of power as a response to that.
However if your loosing coolant through the cap, sounds like over pressure of system. How long does it take from cold start to start leaking? There is obviosuly a pressure release in the camp. Do the coolant hoses go hard? Can you see bubbling in the expansion tank? If you put heater on hot does it blow hot the whole time or vary red hot to cooler then repeat? Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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12th Jul 2020 6:26am |
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| Big Harold Member Since: 09 Jul 2018 Location: nsw Posts: 71  
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The coolant system vents via the cap and will run all over the bottle.
I suggest you have another issue. Are you loosing coolant? The temperature gauge will not move between 85 deg to 110 deg C It will only move at 115 deg then it will go straight to red. The engine will de-rate at 115 deg hence your loss of power. More info needed Year of manufacture KM's other symptoms. |
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12th Jul 2020 6:58am |
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| andydef90 Member Since: 09 Feb 2015 Location: yorkshire Posts: 617 
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what year is you defender ? pumas are prone to faulty caps iv had two on mine is your viscos fan working they can stick so you will overheat
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12th Jul 2020 7:50am |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 327
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Thanks for the input.
It’s a 2009 with 86k miles. Been solid last few years I’ve had her. I do 3-5k miles pa. it’s remapped with silicon hoses and bigger inter cooler. There’s no other issue. On a 140 mile journey the other day it happened twice. Usually happens 20 mins after start up then random. Everything feels normal except for this. This happened once before and I took it in to be looked at. Had EGR properly blocked off, like for like new remap and other valves changed. It seemed to fix the issue but it’s suddenly come back. |
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12th Jul 2020 9:33am |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 327
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Just to add, I’m not losing loads of coolant. I topped up before I left to make sure it was to the line and I haven’t had to top it up. I’ll check again tomorrow before I leave just to make sure.
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12th Jul 2020 9:36am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2646  
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those coolant caps should be considered a service item.
I replace mine every year, it's dirt cheap.  --
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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12th Jul 2020 9:56am |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 327
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I’ll do that as the first option and see if it makes a difference.
I also have a nanocom which didn’t show any issues. |
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12th Jul 2020 10:01am |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8145
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any thoughts on other questions? Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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12th Jul 2020 2:54pm |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 327
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I haven’t felt the hoses and I haven’t noticed any bubbling but I have heard hissing coming from the cap after a journey.
I haven’t tried the heater. When I’ve noticed the gauge going up I’ve come off the accelerator which made it start to come down but last couple of times it didn’t make a difference and went up to max. |
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12th Jul 2020 5:16pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8145
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Change cap see what you get but I think its more than that
, check the hoses for pressure and what heater does wrt to temp changes. 9ne of my 2.4s did a head and gasket and temp gauge never moved off normal! Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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12th Jul 2020 6:08pm |
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| Greyman110 Member Since: 29 Sep 2017 Location: London Posts: 327
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Thanks. I have a long drive tomorrow so will check how things are then.
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12th Jul 2020 8:48pm |
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