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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1101
France 2002 Defender 110 Td5 DCPU Chawton White
Original LR thermostat sux - disappointing
So about 6 months ago I fitted a brand new LR thermostat GBP 60 in my Defender Td5 and ever since it barely manages to get the needle to get out of the blue. Had to drive it hard to get it to about 1/4 and even then it would drop back in the blue on idle.

Annoyed me enough to go and replace it, but with what? What could possibly be better than an original Land Rover part?

Oh hang on, a GBP 30 "OEM" (made in China) thermostat is what you need. Black, if you blow on the bigger pipe (steady on..) it passes no air, while on the Original Land Rover pos plenty of air passes. Fitted OEM and yes heating restored, needle in the middle-ish

Given the number of Landrovers that use this thermostat, you would think they have the quality under control. There goes another myth.

https://rimmerbros.com/Item--i-PEM101021P
Post #1057662 17th Jan 2025 2:01pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6626
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
That's a K series thermostat?  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #1057664 17th Jan 2025 2:25pm
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34064



Member Since: 12 Dec 2023
Location: South Central
Posts: 203
United Kingdom 2003 Defender 110 Td5 HT Alaska White
You should always test new thermostats in a pan of warm water before fitting i have recently had a couple of genuine LR ones fail and i am now on a OEM on the 110 that gets up to temperature and stays there even during the cold 110 Td5 Ex Utilities slowly converting into a pop top camper one day

Build thread:https://www.defender2.net/forum/post1024784.html#1024784
Post #1057672 17th Jan 2025 4:36pm
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1101
France 2002 Defender 110 Td5 DCPU Chawton White
Martin wrote:
That's a K series thermostat?


Sorry you are right I gave the wrong link. I bought PEM100990P. 87 deg



Click image to enlarge

Also available for $9 on Alibaba... Parts nowadays is hit and miss. I tested this one and it is working well, hopefully for years to come
Post #1057678 17th Jan 2025 5:19pm
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Mo Murphy



Member Since: 01 Jun 2008
Location: Letchworth Garden City, Herts
Posts: 2260
United Kingdom 1984 Defender 90 BMW M57 3.0 Diesel HT Auto Pennine Grey
I've had genuine and Waxstat OEM fail to operate properly straight out of the packet. I always test replacements now in a pan of water.
Mo The Land Rover 90 - Many are called, few are chosen.

50 Shades of Pennine Grey
Post #1057693 17th Jan 2025 7:56pm
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NickMc



Member Since: 01 Oct 2014
Location: Norn Iron
Posts: 1643
Northern Ireland 2006 Defender 90 Td5 HT Bonatti Grey
Likewise had a few brand new ones out of the packet not work too.
Post #1057715 17th Jan 2025 11:25pm
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