 | Home > Td5 > low coolant temp/ heat problems |
 
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| Notyalc Member Since: 27 Jul 2018 Location: Northumberland Posts: 139   
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Don’t forget the gauge is linked to the sender by the ecu on a Td5. So the gauge is told what to do by the ecu based on the sender signal.
My Td5 takes a good 10 mins before the gauge starts to move and you feel any warmth, that’s with the fan off, although it doesn’t make a great deal of difference. You can jam the fan hub with a screwdriver if you are careful, and fan is normal thread, so unscrews anti clockwise as you will know by now! They do cool down quickly though, so I would say that any change you have is a mystery! Another quirk of Land Rover ownnership maybe? |
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26th Jan 2021 9:40am |
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| dorsetsmith Member Since: 30 Oct 2011 Location: South West Posts: 4554 |
 Click image to enlarge fan hub spanner 16mm holes x2 |
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26th Jan 2021 10:57am |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2196 
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Have never stripped down a TD5 oil cooler to look at it in detail but I assume it has an oil thermostat integrated within it. I have had very similar symptoms with a 2.2tdci engine (not in a Defender) where the oil cooler thermostat had failed and resulted in the oil being overcooled and symptoms you describe. I wonder if this could be a similar issue?
My own Td5 does take a long time to warm up, especially if you ask too much of the heater before it is warmed up, but I have never noticed the temperature dropping again once upto temperature, Steve 02' 110 TD5 Double Cab Rebuild Thread 84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale Mobile Diesel Heater Build Thread |
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26th Jan 2021 12:18pm |
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| NineCherries Member Since: 10 Aug 2019 Location: Falkirk Posts: 44  
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dorsetsmith - thanks, I had cobbled together a rough tool to get the c=fan off but your diagram is much better (although mine did work) ill keep this on saved on the computer and make a better one at some point.
rallysteve i'm not sure how i can check that but any ideas to look into are gratefully recieved. Well that's the fan back on and new cowling dzus fasteners fitted. coolant is bang on the level and not leaking out. I've been offered access to a diagnostic computer(not nanocom unfortunately) so ill be interested to see what the coolant sensor is reading ( i think it is ok as when the temp needle drops so does the heater air temperature. ) Thanks again for all of your input. Tony |
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28th Jan 2021 1:13pm |
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| Justtellme Member Since: 23 Nov 2015 Location: Ottawa Posts: 305  
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Interestingly, mine has started exhibiting the same behaviour since I removed the under engine cover when I replaced the lower crank pulley several weeks ago.
I think Ill put it back on this weekend and see if it makes any difference. Right now though I have just been leaving the Thermotop C running until the gauge reaches mid range since we have been at -17 C the last few days. Patrick |
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29th Jan 2021 3:39am |
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| NineCherries Member Since: 10 Aug 2019 Location: Falkirk Posts: 44
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Just an update,
From what i can see, it looks like there is nothing wrong  Now that the ambient outside temperature has warmed considerably the engine temperature isn't dropping like it did a few weeks ago and the issue has disappeared. I am still considering a radiator blankets for next winter.
To resolve the secondary issue of very little heat within the cabin of my 110 I fitted a diesel fueled heater. that has made the car much more civilized and much easier to live with over the cold snap. What a difference it has made with defrosting the car, being comfortable, and drying out the car in general. I fitted it between the driver and passenger seats and intend to make a new version of the center cubby box so it isn't too tall, still gives me a useful storage compartment, be easy to remove so any maintenance to the car/heater is easy, to hide the heater and give me somewhere to mount the adjustable air-vents I've bought to allow the hot air to be available to the rear passengers as well as the front, I'll post a new thread about that at a later date. Anyway thank you to everyone who took time to read and reply. |
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24th Feb 2021 9:44am |
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