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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347   
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Hello all!
Bit of an ongoing issue here. In the winter when it is cold, my 110 runs very cold. As a 200tdi this is not too much of a surprise but but after about a 10 mile run it is about up to temperature. However, now that it is summer time, it seems to sit very hot at around 3/4 of the gauge (with 0 being cold and 4/4 being overheat) I have bled the system many times but this dosn't seem to be the problem. Last year replaced the Viscous fan coupling (admittedly with a pattern part but an apparently good one) The Radiator was replaced with a replacement alloy version 3 years ago which has been great and isn't leaking. There is a very slight coolant loss, from half way up expansion tank to bottom quarter over a 4 week period. I have double checked all of the earth points and they are all sound and voltages look fine. The heater matrix isn't leaking (as far as I can tell or blocked but again, how can I tell) Where do I start? What do we think? Can you get a radiator flush? Does it help? Could it just be a faulty sender? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter  |
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30th Jun 2015 8:51pm |
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| I Like Old Skool Member Since: 23 Feb 2015 Location: Manchester Posts: 809 
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Thermostat would be my next swap given the history you have provided.
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30th Jun 2015 9:29pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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Good shout Munch
I have replaced the Thermostat with a genuine one last year when it was playing up but thats no guarantee these days 
It feels like it is opening ok it just never feels like the fan is up to much. When cold it roars away and then dies down but when its very hot on opening the bonnet it is no way near as ferocious as when first started. But a genuine one is very expensive so I want to discount everything else before I commit to buying another one  Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197
Self confessed mileage hunter |
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30th Jun 2015 9:37pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558 
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check out these 2 ebay listings
eBay item number: eBay Item No. 220950417092 eBay item number: eBay Item No. 400100336790 if you look at the picture , your see one has extra part on the bottom , one doesn't , but same part number you normally find both will fit and be same temp range , but will give very different results due to the extra bit if needed sorry but I cant remember if a 200tdi needs the extra bit or not , it is possible to check if you take thermostat out and look down the hole the extra bit shuts a hole off when thermostat opens , and opens hole up when thermostat shuts |
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1st Jul 2015 6:06am |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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Thanks for that Munch
I have ordered a new thermostat from Turners as they know there stuff! I had a very very very hot and sticky drive home in my 110 tonight. When I got home I checked all the hoses and the radiator top hose was too hot to hold. The bottom hose was more comfortable but still very hot so I can deduce that the Thermostat is opening and allowing coolant through the radiator. The fan however didn't seem to be up to much. I could stop it very easily with my fingers and it wasn't really roaring or seemed to be blowing much. I stopped the engine and tried rotating it and it seems quite free so I suspect its the viscous fan which is a real pain because they are so expensive for a genuine part
Can anyone recommend good OEM or good quality replacement? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter |
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1st Jul 2015 8:14pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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My old 200tdi i fitted a electric fan and done away with viscous altogether , fitted auto switch and overide switch , so if towing and hill coming up i could switch on ready
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1st Jul 2015 8:32pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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I have considered going down the Kenlowe route but I want to try and keep the engine bay as original as possible.
Which kit did you use out of interest? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter |
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1st Jul 2015 8:52pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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Cant remember as a few years ago now
no need to alter anything under the bonnet i did leave all the rad cowling out , but you could leave it all in place if you wished getting tempted to do my tdci now |
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1st Jul 2015 8:59pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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OK little update on this....
Fitted a new replacement OEM viscous fan and found that there was a load of orange goo coming out the back of the old one which to me indicates it wasn't up to much. New one fitted to hot engine locked up immediately and produced a torrent of air. Good job
This morning drove to work and while it was running cooler it was still not quite right sat about 2mm from the red. Now thinking of changing the temp sender as its the only thing I havn't changed yet. Other than that I'm at a loss Any other suggestions? Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197 Self confessed mileage hunter |
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3rd Jul 2015 9:55am |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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never had the viscous fan lock up on my 200tdi and always gauge sat just below centre , that was when towing etc
I did have a 4 core rad made for it , but only after fitting bigger turbo etc |
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3rd Jul 2015 11:10am |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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So should I be suspecting the sender then?
Otherwise I have run out of things to change  Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197
Self confessed mileage hunter |
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3rd Jul 2015 11:17am |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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"Otherwise I have run out of things to change"
you never run out of things to change on a defender 
might worth changing the sender , but if its reading hot in the summer then I would think it should read hotter in the winter ( I think you said it reads colder ) it should still read hotter then it is no matter what tempeture is outside if the sender was knackered you can get senders that are all different ranges I know , but sure if that's the problem have you checked thermostat is right one ? might be time to get tempeture checked on a separate gauge |
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3rd Jul 2015 11:59am |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347
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Very True 
I meant I have run out of things in the cooling system to change as I have now changed 1x Radiator (Oem) 1x Water Pump (genuine parts) 2x Viscous Fans (beamach then Oem) 3x Thermostats (all 88'c) (Genuine) 2x Coolants (while flushing out) (Halfords) The only thing I haven't done is the Temp Sender as I didn't want to change too much at once. As you say, in the winter it was struggling to get up to temp and was using a rad muff to help get warm. Even with the muff in it would sit quite happily in the center. I don't have a spare gauge to try it on otherwise I would have done
I'm just really worried about damaging the head as they are hens teeth at the moment and you cant get them new any more and don't really want to buy a whole engine to cannibalize it for parts
If I can find one that is Running Restoration Thread http://www.defender2.net/forum/post323197.html#323197
Self confessed mileage hunter |
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3rd Jul 2015 12:08pm |
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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558
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fit something like this even if just temporily
eBay item number: eBay Item No. 181528699743 |
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3rd Jul 2015 12:17pm |
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