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1st August 2015, 06:56 PM
#1
Cooling system problem
Hey guys and girls. I have an issue I just can't work out. A few weeks ago my patrol smelt hot so I removed the thermostat and it was stuck shut, replaced that but after I run in to town and back 100 klms round trip, when it cools down there is 1/2 ltr of coolant missing from radiator but it's in the over flow. So I thought it was the over flow hose so replaced it and gasket glued it so now leaks. Still missing water in radiator and in the overflow. After a run for 200klms today and waited for it to cool and went to check the water level in radiator and it was pressurised. I have purchased a new radiator cap but do u think I may have a bigger problem. There is no water in oil and no oil in water. Thanks in advance
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1st August 2015 06:56 PM
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1st August 2015, 07:21 PM
#2
Patrol God
So its not recovering the coolant?
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1st August 2015, 07:25 PM
#3
Yeah it wasn't. But now the radiator has pressure in it and when open it sprays water everywhere like it would if it was hot
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1st August 2015, 07:29 PM
#4
Patrol God
Ok. So its pressurised even when not running. Try the cap first as normally if its something more sinister it will only be pressurised when running. Of course it is still possible it could be something worse but caps are very cheap. Stick to genuine if you can.
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The Following User Says Thank You to nissannewby For This Useful Post:
MudRunnerTD (1st August 2015)
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1st August 2015, 07:44 PM
#5
Thanks I got a cap today waiting for to cool will put new cap on in morning. It wouldn't be a crack in head and exhaust gasses getting in cooling system would it
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1st August 2015, 08:06 PM
#6
Patrol God
It could be but I would wait and see if the cap fixes it.
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The Following User Says Thank You to nissannewby For This Useful Post:
MudRunnerTD (1st August 2015)
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1st August 2015, 08:12 PM
#7
I am he, fear me
... most of that sounds normal and it sounds as if there was a fair bit of air left in the system after you replaced the thermostat
A modern cooling system in good nick will often have a bit of pressure in it at the radiator cap.
Remember that the cap seals at 10 to 14 PSI or so depending on rating and above its pressure setting the cap releases and ports coolant to the overflow.
After shutdown any residual pressure has nowhere to go unless you crack the cap albeit it will slowly leak down over time
Any decent amount of air in the system means the the air volume will reduce significantly as it cools (much more so than coolant) and draw coolant from the overflow tank.
If the rad is spurting some coolant (not heaps and heaps tho) when you crack the cap when cool...and... there is no coolant getting blown overboard... and you aren't having to top up the overflow at all IE it is staying between the marks in the overflow then everything should be OK
If in doubt you can 'burp' the cooling system and that new cap sure won't hurt anything
Last edited by the evil twin; 1st August 2015 at 08:14 PM.
Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.
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1st August 2015, 10:59 PM
#8
Thanks guys how do u burp the system
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1st August 2015, 11:29 PM
#9
I am he, fear me
Originally Posted by
aj_vmax
Thanks guys how do u burp the system
Not sure that you will need to but if you do...
Find a bit of a hill/ramp/jump up and park so the top tank of the rad is higher than the motor as much as is practical,
cut the neck off a coke bottle or whatever,
take the rad cap off,
put the heater on full hot
hold the coke bottle neck down in the rad filler,
kick it in the guts at idle, should only need a minute or two...
Any air bubbles etc should collect and escape via the bottle without a heap of coolant going everywhere
Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish.
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2nd August 2015, 06:29 PM
#10
Legendary
If you are not losing water, then it should be ok. If you are losing water and can't find any leaks anywhere around the engine, then you got a big problem.
Little bit of gas inside the radiator that hisses out as you open the cap(cold engine) is ok. If it spurts out lot of gas and coolant along with it(when cold), then
that can't be a good thing.
Exhaust gas test at the the radiator is a very good idea.
If you want, you can buy a kit with the liquid off fleabay and do the test yourself.
I'm developing my own test atm.
I'll post the details, once I've perfected it.
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