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spudfan

Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4473

300 tdi thermostat

Can anybody tell me where the thermostat on the Defender 300 tdi engine is? Heater is not putting out much warm air so I presume that the thermostat is stuck open. It happened to me on a 200 tdi but the 300 is new to me. 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai

1st Jan 2020 4:37pm

Litch

Member Since: 10 Mar 2013
Location: Oxfordshire
Posts: 760

Under here.

Click image to enlarge

Just because the heater isn't giving full heat, doesn't follow that the thermostat is faulty (or even the wrong one has been fitted at some point).
Have you checked the heater control cables to make sure that the internal flap is closing fully and ensuring that all air is passing through the matrix and not around the sides? ONE LIFE, GET IT!

1st Jan 2020 5:40pm

Tompoole

Member Since: 05 Jun 2011
Location: Bucks
Posts: 822

now that's a tidy Tdi engine

Have fun be happy

1st Jan 2020 6:42pm

Oldowner

Member Since: 26 Dec 2018
Location: South west
Posts: 601

2007 Defender 90 Puma 2.4 HT Aintree Green

I remember when they all looked like that, the good old days!

1st Jan 2020 7:31pm

htb2

Member Since: 02 Nov 2018
Location: aberdeenshire
Posts: 509

Auto as well.

1st Jan 2020 9:22pm

sako243

Member Since: 08 Jul 2014
Location: Wales
Posts: 1185

1994 Defender 110 300 Tdi CSW Alpine White

Does the engine get up to temperature? If so then it's more likely the issue is elsewhere. If the thermostat is stuck open or missing then the radiator will be cooling continuously and therefore the engine temperature won't rise as much as it should be. Ed
82 Hotspur Sandringham 6x6
95 Defender 110 300Tdi

1st Jan 2020 10:21pm

Mash

Member Since: 09 Feb 2015
Location: Guernsey
Posts: 1674

Often they have been bled incorrectly in the past leading to poor heating, how hot are the pipes into and from the matrix? Air often gets trapped there reducing the heater output. 90 wolf - Jasmin http://www.defender2.net/forum/topic39408.html
90 V8 - Maggie http://www.defender2.net/forum/topic42564.html
110 TD5 - Buggsy http://www.defender2.net/forum/topic59029.html
52HG25 lightweight https://www.defender2.net/forum/topic72342.html
D3 Hse - Fiona
Capri 2l S - Anna

Think I might have a problem............

1st Jan 2020 10:41pm

spudfan

Member Since: 10 Sep 2007
Location: Co Donegal
Posts: 4473

Lots to check, thank you. The temperature gauge does not get to half way. Like I said earlier, I had the same issue with a 200 tdi and a change of thermostat resolved the issue. 1982 88" 2.25 diesel
1992 110 200tdi csw -Zikali
2008 110 2.4 tdci csw-Zulu
2011 110 2.4 tdci csw-Masai

1st Jan 2020 11:35pm

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