Possible overheating problem

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Menash

Menash

Member
Posts
88
Location
israel
Hi everyone,
I would like to know what you think about a possible problem i have.
I live in a very hot wether, speicialy in the summer. This week the temperature were 40 - 45c. During driving at hot day with a.c of course the temp of the engine usually is 93-96c.ln the last few mounts i had a feeling that the temperatures are higher then before. I allready replaced the termostat, coolant, checked the viscous fan (was o.k in the newspaper test) with no dramatic difference. Yesterday the temp was 100-102 when i drove long inclines.
What do you think should be the next step?
 
One more thing.....
I don't know if i says something but i have notice that the temperature increase much more easyly and quick when the car is standing (traffic)
 
First, when i check the viscous fan i have to say i start working imidiatlly, even in low temp. At 85c i put the newspaper and it was tear apart. I think i never saw my engine work without the fan.
The engine is td5 2004
 
Cars get hotter all over the world standing in traffic. At anything over about 30 mph the engine fan does much less to cool the rad, far more is done by the air passing over/through it due to forward movement.
As @jamesmartin said, check to see the rad is, or is not, hot all over.
The last thing you need is blocked coolant ways in it. Or dodgy fins.
Make sure it hasn't got leaves etc blocking it.
If you have been using good antifreeze and replacing it regularly then your coolant pipes and the rad shouldn't be getting blocked. But I have cured about three peeps overheating problems simply by removing the rad and reverse flushing it like mad. Less likely on a more modern vehicle.
But LRs are tested to put up with your sort of climate.
Does the temp go up, stay the same or fall if you turn the aircon off? Uncomfortable to check I know!
Best of luck!:):):)
 
hoobs said:
When the temp is rising when in stationary traffic does your viscous fan kick in?
Click to expand...
Especially in traffic, stationary or other wise, even here in the UK on a hot summers day. There’s no mistaking the roar of the fan when the viscous coupling is locked, it the loudest noise in my engine bay along the two a/c fans.
Its much the same fan sound I will hear on starting from cold for 20 seconds or so.

Check the coupling when cold ( after parked up overnight) by trying to spin the fan manually, if u can then the coupling is faulty.
 
Menash said:
First, when i check the viscous fan i have to say i start working imidiatlly, even in low temp. At 85c i put the newspaper and it was tear apart. I think i never saw my engine work without the fan.
The engine is td5 2004
Click to expand...
The viscous turns at all times, even when the engine is cold, but it locks up and thus does work when the heat melts the wax in the centre of it and causes it to expand and lock up to the shaft driving it. At least that is my understanding of how it works. They are supposed to be very reliable.
 
discool said:
Especially in traffic, stationary or other wise, even here in the UK on a hot summers day. There’s no mistaking the roar of the fan when the viscous coupling is locked, it the loudest noise in the engine bay along the two a/c fans.
Its much the same fan sound I will hear on starting from cold for 20 seconds or so.

Check the coupling when cold ( after parked up overnight) by trying to spin the fan manually, if u can then the coupling is faulty.
Click to expand...
Disagree, if the engine is cold, the fan freewheels, so you should be able to turn it when it is cold. This is the whole point of a viscous fan, to allow the engine to warm up more easily but then to kick in and start drawing air through the rad as and when needed.
See this as it explains it well and gives yet further checks you can do.
https://www.4wdingaustralia.com/4x4...t=As it warms up, the,to keep the engine cool.
 
Stanleysteamer said:
Disagree, if the engine is cold, the fan freewheels, so you should be able to turn it when it is cold. This is the whole point of a viscous fan, to allow the engine to warm up more easily but then to kick in and start drawing air through the rad as and when needed.
See this as it explains it well and gives yet further checks you can do.
https://www.4wdingaustralia.com/4x4/the-viscous-fan-hub-so-critical-and-so-often-overlooked/#:~:text=How does a viscous fan,more, and engage the fan.&text=As it warms up, the,to keep the engine cool.
Click to expand...
So does the link above have a reference to viscous fluid or does it call it wax ? so what’s your reasoning on the fan roars when when cold... your link may or may not tell you, as it seems u haven’t a clue at the moment

“ This is the whole point of a viscous fan, to allow the engine to warm up more easily but then to kick in and start drawing air through the rad as and when needed.”
Knock me over with a feather i didn’t know that :rolleyes:
 
Is air con rad in good nick fins not collapsing blocking airflow or blocked with crud
Might be worth checking drive from power steering pump to water pump mine failed was running ok when engine was up in the revs but low revs or in traffic started to run hot we think at higher revs there was enough friction to turn the pump
New power steering pump and water pump it behaving itself for the time being
 
discool said:
So does the link above have a reference to viscous fluid or does it call it wax ? so what’s your reasoning on the fan roars when when cold... your link may or may not tell you, as it seems u haven’t a clue at the moment

“ This is the whole point of a viscous fan, to allow the engine to warm up more easily but then to kick in and start drawing air through the rad as and when needed.”
Knock me over with a feather i didn’t know that :rolleyes:
Click to expand...
Knew you'd have to get on and have a bitch as that is mostly what you do to all my posts if you can possibly find a tiny little thing to bitch about.
You and I both know how a viscous fan works but OP may not be aware that when he opens the bonnet and sees it spinning round it may or may not be locked up. He may not be brave enough, with a cold engine to try blocking the fan and then starting the engine to see what happens.

You said this "Check the coupling when cold ( after parked up overnight) by trying to spin the fan manually, if u can then the coupling is faulty."
This is absolutely wrong. You may not be able to "spin" the fan like a whirling dervish when it is cold, but you sure as heck can turn it. It does NOT mean the coupling is faulty it means it is more than likely working correctly.
What can happen, OP, is that the fan can lose the ability to lock up when hot and this is a real problem.
Some cure it by using bolts to lock the two parts together, but the real solution is to get another one.
@discool why don't you just grow up and try to help the bloke rather than simply trying to score points, eh?
Whether the fluid is wax or summat else really doesn't matter whatever it is it works as I described it.
 
discool said:
Sure u can turn the fan when but the amount is restricted, with something resembling a blade width at a time, hence my comment referring to SPIN etc etc.
If you have access to a fully functional viscous fan go and try.
Click to expand...
I don't need to try I know how it works and have done the tests etc.
Arguing over semantics isn't helping the OP.
I am more interested in that than verbally fencing with you.
 
triggersbroom said:
Is air con rad in good nick fins not collapsing blocking airflow or blocked with crud
Might be worth checking drive from power steering pump to water pump mine failed was running ok when engine was up in the revs but low revs or in traffic started to run hot we think at higher revs there was enough friction to turn the pump
New power steering pump and water pump it behaving itself for the time being
Click to expand...
Yeah this is all a good point and I started to hint at it, i.e. the air-con aspect in an earlier post before I stupidly allowed myself to be sidetracked by the idiot who will be nameless's argument.
In my Disco 1 300tdi, I actually removed the viscous just to see what would happen, then fitted an electric fan.
I don't drive around in Israel but in France I do have to climb up to 600 metres in the heat. I only ever needed to switch the electric fan on twice and each time it was while sitting in traffic. The disco in question does have air-con and obvs, when on, the fans take over to a certain extent the function of a radiator fan, but I found that even when air-con was off I had no probs. It is said that diesels run cooler than petrol engines but I have never been able to find a concrete source which supports this, I only have my own experience.
But yes, concur, it is important to ensure all parts of the cooling system are absolutely up to scratch if you live in a hot country.
 
I suspect that my viscous is coupled all time for two reasons:
1) I don't ear the sound of the coupling. I have been told the the coupling makes special sound i am not supposed to miss.
2) again, the fan passed the paper test (youtube film)
Tomorow i will film the fan while starting the engine to show you what i meen
I understand that the next thing to do is checking the rad temp gradiant. If you have any more ideas i will be thankful
 
Menash said:
I suspect that my viscous is coupled all time for two reasons:
1) I don't ear the sound of the coupling. I have been told the the coupling makes special sound i am not supposed to miss.
2) again, the fan passed the paper test (youtube film)
Tomorow i will film the fan while starting the engine to show you what i meen
I understand that the next thing to do is checking the rad temp gradiant. If you have any more ideas i will be thankful
Click to expand...
If you suspect what you say at 1) then simply open the bonnet with the engine cold and see if you can turn the fan by pushing it round by hand. If you can, although it may take a little effort, then that is normal, if you can't then it IS coupled all the time. With three Discos, two of which have viscous fans, I have never heard this famous coupling noise. Sure the fan makes a huge noise when it is turning, so it should!

If the fan is coupled all the time this is less of a problem as it will at least be doing what it is supposed to be doing when the engine is hot.

I notice no one has mentioned oil, level of and oil cooler.
Don't know if this could be important.
Also is OP seeing any drop in coolant level?
Anyway this is for interest in case he or others need to sort out O rings on the oil cooler/heat exchanger
https://www.aulro.com/afvb/discovery-2-a/160458-td5-oil-cooler-repair.html
 
It's a bit of a faff but it might be worth unbolting power steering pump and check the coupling on the end of the shaft is still fused to the shaft mine just fell off
Is thermostat fitted correctly if fitted wrong way it blocks feed to radiator when open and just circulates around the engine
 
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