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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5743
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Lack of heat... :-(
Recently a lack of heat from the heater. Lots of flow and max movement on the heater hot/cold lever at the heater box end. Also temperature lever moves full distance at the heater box.

Got the thermostat replaced with a gen LR item and that appeared to help but as the temperature has got lower the new 'stat hasn't really helped.

Coolant level is OK.

If I leave the heater off for a while and then turn the heater on, I get a warm blast of air which then drops off to cooler air.

Next move I think is to either replace the heater matrix or water pump?

Unless I am missing something else? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #804405 2nd Dec 2019 9:36am
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4784
United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
I don't like scaremongering, but those were the exact symptoms I had before I diagnosed my head gasket failure. Or more precisely discovered that my 15p engine had 10p plastic dowels - causing head float and therefore head gasket failure type symptoms.

I changed the water pump first, it was fine. I replaced the thermostat, that was fine.

Try removing the jubilee clip off the heater matrix when the engine is running and see if you get air out, by pulling the rubber hose back past the barb on the heater matrix pipe.

Mine was getting combustion gasses in the coolant, this was causing an airlock to gather at the highest point in the coolant system (the heater matrix) so no /little heat.

Definitely change the water pump first though, it's possible that it's failing /wearing out. Thumbs Up 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton
Post #804410 2nd Dec 2019 10:22am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5743
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Hi
I hope its not the head as this was replaced with a brand new AMC head around 6 years ago.
I have not replaced the water pump and I have owned the car for 8 ish years and has done 225k so maybe.... 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #804415 2nd Dec 2019 11:10am
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OsloBlue



Member Since: 14 Jul 2018
Location: Essex
Posts: 822
United Kingdom 2003 Defender 110 Td5 XS CSW Oslo Blue
grafty99 wrote:
Or more precisely discovered that my 15p engine had 10p plastic dowels - causing head float and therefore head gasket failure type symptoms.

How is a 15P a 15P if it has 10P plastic dowels?

Was it an incorrect service overhaul or? I'm on IG: https://www.instagram.com/osloblue42/
Current: TD5 '110 "Lucinda" Thread here: https://www.defender2.net/forum/topic62562.html
Post #804417 2nd Dec 2019 11:22am
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4784
United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
Mine is a very early 15p, typical landrover must have used what they had to hand when building my engine. Installed with plastic dowels. Its the original engine and definitely a 15p. It has the external fuel return and green top injectors. (not to forget the 15p engine number).

When I got it from a landrover main dealer it had a full service history and I requested a warranty work report. The engine had never been touched other than servicing Thumbs Up 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton
Post #804427 2nd Dec 2019 12:33pm
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OsloBlue



Member Since: 14 Jul 2018
Location: Essex
Posts: 822
United Kingdom 2003 Defender 110 Td5 XS CSW Oslo Blue
You got me worried now, did you convert to metal dowels? I'm on IG: https://www.instagram.com/osloblue42/
Current: TD5 '110 "Lucinda" Thread here: https://www.defender2.net/forum/topic62562.html
Post #804431 2nd Dec 2019 12:52pm
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 4784
United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue
I did yes, no problems since. Although it lasted 125k miles before giving any trouble. Done about 15k miles on the new head with metal dowels. No problems so far Thumbs Up 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Td5 90 Thread http://www.defender2.net/forum/topic50767.html
Tdi 110 Thread https://www.defender2.net/forum/topic69562.html
RRC Thread http://www.defender2.net/forum/topic54492.html
Instagram http://www.instagram.com/george_grafton
Post #804435 2nd Dec 2019 1:52pm
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rallysteve



Member Since: 10 Feb 2014
Location: Cumbria
Posts: 2200
United Kingdom 2002 Defender 110 Td5 DCPU Keswick Green
I have always found this with our TD5. Use of the heater on full before the engine is upto temp means it takes forever to warm up in cool weather. Sometimes it even cools the engine back down again!

I find it quite funny that the TD5 heater is so terrible at heating the car, but actually quite effective at cooling the engine! Rolling with laughter

Is your viscous fan rotating freely with the engine off (i.e. not seizing up and overcooling the radiator)

Steve 02' 110 TD5 Double Cab Rebuild Thread
84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale
Post #804438 2nd Dec 2019 2:16pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5743
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I did replace the viscous fan a while ago but have not checked it since. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #804440 2nd Dec 2019 2:18pm
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Notyalc



Member Since: 27 Jul 2018
Location: Northumberland
Posts: 140
United Kingdom 2003 Defender 90 Td5 HT Epsom Green
Just take the fan off. I don’t think it does much unless you are towing 3500 kg anyway!

Mines off, but I don’t think it makes much difference to warm up time....
Post #804502 2nd Dec 2019 8:23pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5743
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Is there a method of checking the water pump? I was thinking remove the bleed screw and see if water jet pops out? 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #804897 5th Dec 2019 8:59pm
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4RF RDS



Member Since: 19 Jul 2015
Location: Ottawa
Posts: 898
Canada 2000 Defender 110 Td5 XS CSW Epsom Green
Re: Lack of heat... :-(
excossack wrote:
Recently a lack of heat from the heater. Lots of flow and max movement on the heater hot/cold lever at the heater box end. Also temperature lever moves full distance at the heater box.

Got the thermostat replaced with a gen LR item and that appeared to help but as the temperature has got lower the new 'stat hasn't really helped.

Coolant level is OK.

If I leave the heater off for a while and then turn the heater on, I get a warm blast of air which then drops off to cooler air.

Next move I think is to either replace the heater matrix or water pump?

Unless I am missing something else?



Did you have heat before? (And... before what you ask?). Did you do anything to the cooling system recently?

If so you may well have an air lock... my heater has been pumping scalding hot air for years. I find the Td5 better than previous versions. 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)
Post #804903 5th Dec 2019 9:34pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5743
United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I did have heat but over time I think its cooled down a bit and then over summer never really noticed/needed heat. Got the thermostat replaced the other week and better heat was back. But as weather got cooler, I don't have much, certainly not as good as it once was.

Not changed anything for a while on the cooling other than recent thermostat. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #804905 5th Dec 2019 9:38pm
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4RF RDS



Member Since: 19 Jul 2015
Location: Ottawa
Posts: 898
Canada 2000 Defender 110 Td5 XS CSW Epsom Green
Try temporarily putting some cardboard in front of the grill and see if it heats up. Could just be a really efficient radiator or your clutch fan is seized. If so you may need a rad bra to generate more heat in winter months Thumbs Up 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)
Post #804907 5th Dec 2019 9:41pm
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landy andy



Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5420
2006 Defender 110 Td5 USW Zermatt Silver
Get the fan off and see what you got
Post #804910 5th Dec 2019 10:17pm
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