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Buz



Member Since: 24 Jan 2014
Location: Forest of Dean
Posts: 238

United Kingdom 1987 Defender 90 200 Tdi HT Barolo Black
200tdi getting hot!
Possibly been done to death but I can't seem to find anything via search!
Basically, temp gauge rises past normal and well into the red. Heater is working fine with hot air being blown out. Ive checked the radiator and this is cold, top hose is hot but bottom hose is cold.
My 1st guess is the thermostat but the pipe leading away from it is hot. Radiator hasn't been changed recently and system hasn't been drained down so cant think of it being an air block.
Whats your thoughts?
Post #742747 28th Nov 2018 11:37am
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c18rch



Member Since: 28 Nov 2012
Location: Sheffield
Posts: 28

United Kingdom 1988 Defender 110 200 Tdi HT Keswick Green
If it were me I would bleed the system just to be sure first, then....

Have you checked what the temp actuually is? Does it get hotter more quickly than you would expect?

Get one of those IR thermometers of ebay/amazon (~£8 ) if you haven't got one already. Check what temp the core plugs etc are actually at.

If it is not actually getting up to temp, it is the sender or the guage. I had a bad earth on the temp gauge which made it look as though it were overheating. Engine wasn't even warm. 1988 110 200TDi Hard Top


Last edited by c18rch on 28th Nov 2018 1:48pm. Edited 1 time in total
Post #742755 28th Nov 2018 12:40pm
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Whirly90



Member Since: 01 Sep 2016
Location: Ampshire
Posts: 398

England 1993 Defender 90 300 Tdi HT Keswick Green
Make sure it really is over heating, it's a Tdi engine in a pre-Tdi vehicle so it could be that the sender and gauge are incompatible. I had the same problem and ended up putting an aftermarket gauge/ sender in, problem solved.
Post #742758 28th Nov 2018 12:48pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6460

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
Is it a Disco engine?

If so it might want the sender swapping to PRC6663 which fits the 200 Tdi Disco engine but is the correct type for a Defender gauge (it's the 2.5TD/NA/etc sensor).  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #742762 28th Nov 2018 1:00pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6460

United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
OK I can see it is a Disco engine Wink https://www.defender2.net/forum/topic55755.html

Has it always done it or only just started?  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #742766 28th Nov 2018 1:07pm
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Buz



Member Since: 24 Jan 2014
Location: Forest of Dean
Posts: 238

United Kingdom 1987 Defender 90 200 Tdi HT Barolo Black
Hi Martin, yes it is a Disco 200, you are correct, it has only just done this, usually drives with the indicator slightly under halfway, even in the hot summer.
I changed the thermostat (not ad chance to test the old one). Took it for a run, it is now staying just above the halway, so seems a little hotter than before.
I did notice the old Thermostat had an 82c opening where the new one is 88c, so I guess tis will make it run slightly warmer.
I ave one of the IR temp sensor things. The thermostat housing is about 60c on the outside, the block is running anywhere from 60-70c depending on where the temp is read. The rad is reading 51c where water enters and 30-45 where it leaves the rad at the bottom. This fluctuation I guess is due to the thermostat opening or closing?
Post #742800 28th Nov 2018 4:25pm
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OJ



Member Since: 23 Nov 2018
Location: North of Edinburgh
Posts: 120

Scotland 2015 Defender 90 Puma 2.2 XS CSW Corris Grey
It might be worth checking the sender unit, had a similar problem but it was created by someone fitting the wrong sender in the past. Gave all the indications of overheating but it wasn’t, your engine temperatures are similar to my 300 tdi.
Thumbs Up
OJ
Post #742812 28th Nov 2018 5:50pm
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Romadog



Member Since: 07 Jul 2011
Location: Powys
Posts: 1746

Check the rad is not furred up....
Had a 200tdi some years ago and fitted many thermostats to alleviate the sudden overheating.
Also changed water.pump!
Turned out to be furred up rad inside. Used correct coolant but still did this. There's a volume that it should hold, I suggest testing how much it currently holds and compare. Thumbs Up
Post #742845 28th Nov 2018 7:33pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7664

2011 Defender 110 Puma 2.4 USW Stornoway Grey
The ir temps seem ok to me and thermostats, rad seem to be fine.

Electrical? Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop
Post #742856 28th Nov 2018 7:44pm
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OJ



Member Since: 23 Nov 2018
Location: North of Edinburgh
Posts: 120

Scotland 2015 Defender 90 Puma 2.2 XS CSW Corris Grey
Romadog wrote:
Check the rad is not furred up....
Had a 200tdi some years ago and fitted many thermostats to alleviate the sudden overheating.
Also changed water.pump!
Turned out to be furred up rad inside. Used correct coolant but still did this. There's a volume that it should hold, I suggest testing how much it currently holds and compare. Thumbs Up


Sounds like a good plan, at least give it a good flush anyway, mine holds about 10 litres from memory,
Post #742859 28th Nov 2018 7:51pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7664

2011 Defender 110 Puma 2.4 USW Stornoway Grey
If the rad is taking it from 50 to 30deg surely it's working Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop
Post #742863 28th Nov 2018 8:01pm
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OJ



Member Since: 23 Nov 2018
Location: North of Edinburgh
Posts: 120

Scotland 2015 Defender 90 Puma 2.2 XS CSW Corris Grey
Good point James, suppose its a process of elimination until the faults found, if the stats been dropped to an 82 in the past it may be a historical problem

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Post #742864 28th Nov 2018 8:07pm
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Buz



Member Since: 24 Jan 2014
Location: Forest of Dean
Posts: 238

United Kingdom 1987 Defender 90 200 Tdi HT Barolo Black
Thanks everyone for the great input.
The rad was replaced within the last 3 years so I would hope it isn't furred up (yeah, I know it could be)
The thermostat was changed also about 3 years ago, I'm guessing it was the only one the guy had available at the time, rather than an 82c being used for a specific reason.
The bottom of the rad goes from warm/hot to virtually cold at intervals, so I'm assuming this is the thermostat opening/closing and making the temp difference.
I think the next plan is to drive it, carry spare water with me, check levels often, if the gauge starts to go up, use the IR meter to see where any hot spots are.
Post #742905 28th Nov 2018 11:08pm
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OJ



Member Since: 23 Nov 2018
Location: North of Edinburgh
Posts: 120

Scotland 2015 Defender 90 Puma 2.2 XS CSW Corris Grey
Hi Buz
Is the viscous fan still in place and working, if so how far away from the radiator is it, if the disco engine has been fitted further back the fan may not be doing anything useful, its fairly common to remove the viscous fan and fit an electric one closer to the radiator thats more efficient.
Hope you get it sorted
OJ
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Post #742934 29th Nov 2018 11:11am
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7664

2011 Defender 110 Puma 2.4 USW Stornoway Grey
I have a disco 200 in a defender with viscous fitted, shortened blades, although long way back from cowling with rad in std place works fine on cooling front. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop
Post #743099 30th Nov 2018 6:04am
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