I think if his stat was fitted wrong, in the heat he is driving in he'd know about it pretty quickly!
Tother point is interesting though!
Tother point is interesting though!
triggersbroom
Active Member
My symptoms where similar ran spot on when revs where up but low revs or in traffic she started to get hot changed rad and thermostat to no avail
Pump was last to change after reading a few posts of impellers breaking free but the coupling came off the ps when the pump was removed
Pump was last to change after reading a few posts of impellers breaking free but the coupling came off the ps when the pump was removed
NPG
Well-Known Member
I read about a few cases where this happened on the TD5, even though the thermostat has markings on it indicating the flow and orientation. I also realise that this was mentioned already by @triggersbroom so sorry for that.
However, the point I'm trying to make is that if I was the OP, I would go over the work done and make sure that it's 100% before I start pulling other things out. Like checking if the system is properly bled and that the coolant is the correct type (OAT) and mixed in the right proportions. Especially since coolant additives reduce the heat transfer properties of water, maybe the mix has too much coolant in it for such a hot environment.
Menash
Member
NPG
Well-Known Member
While I'm not familiar with CAT ELC, the literature does say that it contains nitrites, which in effect makes it a NOAT (Nitrited Organic Acid Technology). This is in contrast with LR's recommended OAT, which is nitrite-free and therefore the chemical composition is not the same. On paper, certain characteristics of CAT ELC do look superior when compared with conventional OAT such as its higher boiling point. What I don't know is if these better specs are in any way affecting the coolant's efficiency to absorb heat at the specified rate, as intended by the D2 design. I know for certain that OAT's performance is drastically reduced if mixed with a nitrite-based coolant and so the question is how much of the original OAT coolant remained in the system before adding CAT ELC.
The attached image shows a prediluted 50/50 mixture so there was no need to add water as long as the total concentration of coolant in the system does not exceed 60%. Everything considered, you might be OK and the problem could be somewhere else as suggested by other contributors but I personally wouldn't have used a NOAT. As a suggestion, perhaps you might want to replace 1L of coolant with purified water and see if things will improve.
sierrafery
Well-Known Member
Just seen this
No worries, up to 105*C under load or while climbing at above 35*C ambient temp is perfectly normal especially if you have bigger than standard tyres too...if it goes below 100 while you descend or drive it easy it's no problem
NPG
Well-Known Member
The primary cooling agent in engine coolant is water because it's cheap and has excellent heat transfer and thermal capacity properties. All the other chemicals typically found in coolant such as ethylene glycol are added to modify the properties of water (freezing point, boiling point, etc.) and to provide corrosion protection for particular metals such as aluminium. As expected, these additives will also affect the heat absorption rate of water and will in fact reduce the cooling performance. Hence, the more water you have in the mix, the more efficient the heat loss from the engine. Because of this and given your hot climate, I would personally use 33% coolant and the rest just water and replace every 3 years instead of 5. The cooling system operates under pressure and at 1.4 bar (the point when the relief valve on the pressure cap opens), the boiling point is raised from 104°C at 1 bar to around 113°C using conventional OAT at 33% volume. Given that you have CAT ELC, this would be even higher, up to around 130°C. As for the freezing point, I don't think temperatures below -20°C are of concern in Israel.
I personally use Halfords OAT concentrate but I doubt if this is available where you live. But any standard nitrite-free OAT should do.
NPG
Well-Known Member
And did you have the same issue before you did the change ?
Menash
Member
I had the feeling that my car is getting too hot before checking the fan and replacing the thermostat. That was the reasone i did it. I really don't know if the changes made any difference at all. At least not yet
I think i will check the rad and then see....
My mechanic say that i should replace viscous fan and see, and for that o need to buy one...
I think i will check the rad and then see....
My mechanic say that i should replace viscous fan and see, and for that o need to buy one...
Without wishing to reignite the viscous fan argument, there is a simple way of testing to see of it comes on or not.
First do the test i mentioned before, i.e. check it moves relatively freely when the engine is cold, then drive the car till it gets hot, park the car, put the engine off then immediately try the same test, the fan should not move at all.
Only if it does move, under hand pressure, would I consider replacing it.
sierrafery
Well-Known Member
You worry too much, as i said at those temps which you mentioned it's no problem at all, though aybe you'll create some if you insist 
NPG
Well-Known Member
If you are sure that it was doing it before you renewed the cooling components, I suggest you either do what Stanley is suggesting or take SF's input on board and keep monitoring the coolant system, especially if your observations of high engine temp were made when humidity was higher than usual. As humidity goes up, air becomes lighter and carries less oxygen molecules. This will impact radiator cooling and the air pressure created by the viscous fan inside the engine bay. You did not mention if you are experiencing reduced performance but the increased water vapor and reduced oxygen in humid air will also effect combustion, i.e. the flame temperature is reduced. I would suspect that the ECU will compensate for this with additional fuel and restricted EGR gases so the engine might be running a little bit hotter for this reason. The MAF sensor is critical for the ECU to correctly adapt to changes in the ambient environment so perhaps it would be a good idea to run some MAF live readings and post them here for discussion.
Menash
Member
It is hard for me to evaluate the performance because the my disco is used 100% for trips on weekends and for some reasons (i had a lot of faults lately) i barely drove it for the last 6 mounts. I am afraid my evaluation can misleads me and you....
About the EGR... i blanked it....
I can disconnect the MAF and evaluate if it works because i don't have nanocom for the live readings .
Do you think a small leakage of coolant can cause a reduced pressure and efficiency of the system? If you think so, i have a small leakage i suspect from the coolant pump area- Might worth invastigation
About the EGR... i blanked it....
I can disconnect the MAF and evaluate if it works because i don't have nanocom for the live readings .
Do you think a small leakage of coolant can cause a reduced pressure and efficiency of the system? If you think so, i have a small leakage i suspect from the coolant pump area- Might worth invastigation
sierrafery
Well-Known Member
No it can't as long as the tank has coolant in it... i'm telling you for the last time that you worry for nothing at the temps you described in your first post
NPG
Well-Known Member
This could be another reason for the engine temp being a bit higher than normal as the fuel / air mixture contains only oxygen that will produce higher flame temperature.
You will see a difference in performance if you do that but it's not a conclusive test. So can I ask what tool did you use to read the coolant temp ?
The thing with a leakage is that if coolant can come out, air can go in and you can end up with an air lock. But this depends how small is small and if it is even noticeable at the coolant level in the expansion tank. Note that the coolant pump has a weep hole, designed to leak coolant which would otherwise end up in the bearing. It would be a very small amount but you'll see the red staining nonetheless. So unless this leak is significant, I wouldn't worry about it.
