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TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 823

2002 Defender 110 Td5 DCPU Chawton White

can't get the temp up on my Td5

The temp on my Td5 is steadily going down. I changed the thermostat and now she does not even get out of the blue!

The thermostat was original (2001) and I replaced with a Land Rover item. It makes me wonder if the thermostat is fitted wrong, but if I recall the hose diameters make it hard to fit it wrong.

Bottom hose to RH bottom of radiator, top straight hose connection to top of radiator (and bypass hose to head), oblique cose connection to pump.

The way I imagine it works is that with the thermostat closed, the pumps sucks through the bypass hose circulating water through the engine only, then with the thermostat opening it starts to draw water from the bottom radiator hose?

Somehow I can't make this work logically in my head.

1st Apr 2024 8:19am

34064

Member Since: 12 Dec 2023
Location: South Central
Posts: 110

Did you test the Thermostat before fitting as I bought a genuine LR one 2 years ago that was faulty from the start and had to replace it albeit on my D2 at the time 110 Td5 Ex Utilities slowly converting into a pop top camper one day

Build thread:https://www.defender2.net/forum/post1024784.html#1024784

1st Apr 2024 9:24am

geobloke

Member Since: 06 Nov 2012
Location: Nottinghamshire
Posts: 4410

I am going to ask the question... The gauge may not move but is the engine getting to temperature? Can you get a laser thermometer onto the hoses/block to test.

Just wondering if it isn't a bad earth to the gauge, a duff sensor or broken wire to the sensor?!

But it could be the new thermostat too.

If it would help I am happy to pop out and measure the voltage to the sensor, I believe the sensor has a range from 0-5v.

1st Apr 2024 11:03am

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 823

34064 wrote:
Did you test the Thermostat before fitting as I bought a genuine LR one 2 years ago that was faulty from the start and had to replace it albeit on my D2 at the time

Everything is possible but before fitting I checked the thermostat and it was closed. If it was not to open it would overheat no?

Click image to enlarge

Click image to enlarge

I can check the temp with nanocom, and i do have an infrared thermometer somewhere. Will do that first

1st Apr 2024 3:10pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7731

2011 Defender 110 Puma 2.4 USW Stornoway Grey

does the heater work as normal? Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

1st Apr 2024 7:00pm

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