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ARC99

Member Since: 19 Feb 2013
Location: North Yorkshire
Posts: 1831

2008 Defender 110 Puma 2.4 USW Cairns Blue

Just a thought.

Have you changed the thermostat or temperature sender unit recently?

When I needed to change the, on my 2.5 90 and 300TDi both had two part numbers listed and on both occasions I was sold the incorrect part, the 2.5 ran hot and the 300TDi ran cold until \I swapped them. It turned out that Engine and chassis numbers didn't match up with Land Rover record on both occasions. Don't make old people mad.
We don't like being old in the first place,
so it doesn't take much to

us off.

Richard

29th Dec 2019 9:04am

excossack

Member Since: 22 Feb 2012
Location: North West
Posts: 5852

1999 Defender 110 Td5 SW Caledonian Blue

Hi. The thermostat has been changed. Aftermarket and gen LR one. AFAIK only one setting for the TD5 unless anyone knows of another? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock

29th Dec 2019 9:28am

thinman21

Member Since: 27 Jan 2020
Location: Nottingham
Posts: 11

I have the same problem with my TD5 - so interested to see what the possibles are here, I'll be checking my viscous fan later...

Just a thought, when the car is hot, are both heater matrix pipes 'hot' (i.e. too hot to touch)? Mine get hot but not scalding....

Like you I've already checked the heater box vent things move ok, flushed the matrix and checked the engine temp is ok.

I considered doing the thermostat, but its not showing any problems with the engine itself - only the heater plumbing.....

6th Mar 2020 8:15am

excossack

Member Since: 22 Feb 2012
Location: North West
Posts: 5852

I have improved the heat. I replaced;
Thermostat - aftermarket and genuine LR
Checked the controls for the heater - all good, but did note the flap control one had slipped in the clip so altered this.
Flushed the matrix

All the above offered no real improvement.
Short of water pump replacement which had been mentioned and replacing the matrix.
I opted for the matrix replacement in the end.
When I eventually stripped the heater matrix out I found bits of rubber glove, mud, bits of wood splinters and a few blocked fins., Also the matrix despite being flushed still contained sludge/rust.
A new matrix and adjustment of the flaps so the main flap sealed better against the main housing the heat is back.

Still not 100% convinced I have the heat output I remember but at least it gets warm now, rather than before it felt like the same air outside as inside.

There is a foam gasket around the matrix from memory which I didn't get so had to improvise and there is also one between the heater housing and the bulkhead which I resealed the best I could with sealant.

good luck. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock

6th Mar 2020 8:40am

CDN38

Member Since: 14 Nov 2014
Location: Courtenay, BC
Posts: 729

I went through similar frustration trying to find the issue. Did the water pump, thermostat, already had a new Allisport matrix in.... turned out to be a head gasket. Did the gasket, and replaced the head, new reservoir cap. Instant heat... well, instant enough for a diesel.

Click image to enlarge it's a Landrover thing...

my renovation thread:
http://www.defender2.net/forum/topic40792.html

6th Mar 2020 4:56pm

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