Member Since: 28 Mar 2019
Location: North
Posts: 12
TDV6 Running cool
Hi all,
Please can I ask for some advice regarding a cool running issue. My temp gauge barely gets halfway and often dips when driving. It will creep up to half when the FBH Is on but if you hit the motorway at 70mph it will go down. Cabin heater appears to work as in it keeps me warm
I am not sure if it's coincidence but I think this started a few months after getting both EGR's replaced. I realise these have EGR coolers but I'm certain the actual EGR is separate to that.
I have had the thermostat near the radiator replaced along with coolant flush and this did not cure. Next idea I have is to change the coolant temp sensor at the top of the engine.
Any advice would be very much appreciated as I am sure it would run better if temps were normal etc. Also at my witts end as god knows what else it could ne.
Many thanks
John
28th Mar 2019 4:55 pm
Jarvis
Member Since: 16 Dec 2009
Location: West Berkshire
Posts: 278
Could the viscous fan be running all the time? I think the IID Tool gives some live data on it.
28th Mar 2019 5:14 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4651
The symptoms you describe would point at the thermostat stuck open. Was the temp OK before you changed it? If the engine is overcooling due to a faulty thermostat, you should notice black smoke from the exhaust under hard acceleration. If so, the thermostat is likely to be faulty. A temp test of the top radiator hose would be a good indicator of an open stat. If that is satisfactory you could try the sensor and see if that's the issue.yµ (idµ - eAµ) ψ=mψ
28th Mar 2019 5:17 pm
TDV62019
Member Since: 28 Mar 2019
Location: North
Posts: 12
Many thanks both for the replies. I should have mentioned fan is functioning correctly and also the temps were lower and gauge not halfway before and after stat change.
I have also used my I carsoft LR scanner with no fault codes present and have been monitoring live data.
In the meantime I will order a temp sensor and swap over, seems easy enough! is there any other sensors work changing?
Please do keep feeding any ideas whilst I wait for it to arrive
many thanks
John
28th Mar 2019 5:29 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8093
Oil temp sensor works along side water temp sensor.
Also the gauge doe not work like a thermometer, in other words it does not climb slowly to give an accurate reading more like in steps, so halfway covers a range of temperatures not just one temperature, you will find if it gets hot it will suddenly jump to hot. Also normal running temperature indication depends on where the gauge needle is zeroed when cold. I have seen a gauge zeroed at around 1/4 when cold, when normal it read hot, and when very hot went all the way round to cold.
I should be asking if it has just started doing this or has it always done it?
Checking the temperature with a cheap infra red thermometer is the best and cheapest way forward
. It can when others can't,
It will when others won't,
It goes where others don't.
28th Mar 2019 5:52 pm
KostasA
Member Since: 23 Aug 2015
Location: nairobi
Posts: 286
Also make sure that when the EGRs were blanked the cooler lines are not bypassed (looped). if they are then most likely that's why you are running cold.
or the thermostats from the EGR have been removed.
28th Mar 2019 6:54 pm
Tripe
Member Since: 28 Jun 2015
Location: Tasmania
Posts: 285
I had similar problems with temp gauge,
Replaced oil temp sensor and it fixed problem.
29th Mar 2019 2:12 am
defector
Member Since: 23 Feb 2009
Location: Greater Manchester
Posts: 1420
EGR coolers up to 07 (EU3) have no thermostats - the main thermostat controls the water flow through the coolers.
EGR coolers 07 and on (EU4) have a mini thermostat in each EGR cooler in the cooler flow pipe.
So depends on which year your D3 was produced.
Last edited by defector on 29th Mar 2019 5:12 am. Edited 1 time in total
29th Mar 2019 4:13 am
Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
Does it not say that the radiator is working properly as there would be lots of cold air at 70 mph
29th Mar 2019 4:48 am
TDV62019
Member Since: 28 Mar 2019
Location: North
Posts: 12
Thanks all for the further responses.
The car has a 2008 and has a DPF so I take it will be euro 4. The egrs fitted were not genuine landrover or jaguar units but apparently a decent enough make, can the EGR's control the temp? or is it down to the coolers on their own? Nothing was mentioned about the coolers when the egr's were swapped, in fact I doubt the coolers were touched or removed etc.
Thinking back I did not have the problem 6 months ago however I reckon it was a couple of months after the egrs were done it was taking an age to warm. EGR function and reading on live data are good.
I will swap the coolant temp sensor and look into doing the oil sensor as her next oil change is due soon.
Are the sensors a common enough problem?
29th Mar 2019 10:53 am
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8093
Oil sensor yes, more likely than coolant sensor, it can be changed without draining the oil if you are quick, just wear gloves and not when the engine is hot It can when others can't,
It will when others won't,
It goes where others don't.
29th Mar 2019 11:11 am
TDV62019
Member Since: 28 Mar 2019
Location: North
Posts: 12
Thanks I will get looking for one. Already oreded a coolant one so will just swap that over anyway.
Just plugged in and after a 13 mile ride mix of town and motorway including some high revs. Coolant 80 degrees and oil 75 degrees.
Cheers
John
29th Mar 2019 1:39 pm
TDV62019
Member Since: 28 Mar 2019
Location: North
Posts: 12
Apologies for not updating the thread. I have replaced the coolant sensor however this has not made a difference gauge still does not get halfway and dips on the motorway.
The car is due an oil change in the coming weeks so I shall swap over the oil temp sensor and see what happens.
I am thinking more towards the new thermostat being dodgy, although this would be bad luck! Perhaps it was not changed despite me being charged who knows.
Thanks
John
19th Apr 2019 10:53 am
TDV62019
Member Since: 28 Mar 2019
Location: North
Posts: 12
Update - Managed to drop the oil and change the sensor. Unfortunatly it has note made a differance.
It would appear that I need another thermostat as either the new one is faulty or it was never changed.
I think I would be better off replacing the stat before looking at EGR coolers.
Cheers
John
22nd May 2019 3:04 pm
groveraus
Member Since: 05 Feb 2012
Location: Canberra
Posts: 3
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