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jesperjes

Member Since: 26 Dec 2013
Location: Denmark
Posts: 9

2002 Defender 110 Td5 DCPU Java Black (black Hood)

Problems with the heating

I'm having problems with my 2002 110 TD5. The heating inside the car has a life of it's own. Sometimes it works fine and then suddenly only cold air is coming out. The needle in temperature gauge is a little to the left of 12 o clock. If I turn on the Webasto while driving when cold air is coming out I can mostly get hot air again. When the Webasto has run for 5 min I turn if off and hot air will continue, sometimes cold air will return. It is different when the hot air stops, it can be in city traffic or on the highway.

The Webasto runs every morning and the car delightfully warm when I get in.

I've noticed that there is some overpressure in the system next morning (before the Webasto) if I remove the cap from the expansion tank. I can also see traces of coolant on the expansion tank.

I'm loosing about ½ litre of coolant every other week. I can't really see any leaks in the system.

Any ideas of where to look?

4th Dec 2015 2:25pm

dorsetsmith

Member Since: 30 Oct 2011
Location: South West
Posts: 4554

heater matrix itself tiltall small leak down buckhead under heater box, engine cylinder head right hand side, 1. 1/4``round thread plug in head underneath metal gasket for exhaust manifold tiltall small leak down right side engine block collects at the bottom

or your head gasket

4th Dec 2015 2:48pm

mk1collector

Member Since: 17 Sep 2009
Location: West Yorkshire
Posts: 6769

Over pressuring suggests head gasket Ray
My build thread
http://www.defender2.net/forum/topic17615.html

4th Dec 2015 4:24pm

wyvern

Member Since: 14 Dec 2009
Location: Cornwall
Posts: 2076

2012 Defender 110 Puma 2.2 XS CSW Firenze Red

Check your water level in the Radiator header tank - we had a couple of TD5's and the water seeped away some times and the temp dropped on the heater. (on both the Defender and Disco 2 ) Poppy - TDCI (Puma) 110XS 2.2 - Camper conversion - see the build here - https://www.defender2.net/forum/topic56530.html
Elgar -TDCI(Puma) 110XS Dormobile - now sold
Devon & Cornwall 4x4 Response - DC126

4th Dec 2015 5:21pm

CDN38

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

Check the operation of the thermostat.

Cracked heads are common too... check your oil level, see if any coolant has been making it to the sump. Have you had any excessive white exhaust (burnt coolant)? May want to have your oil tested for coolant.

When you see that much coolant disappearing, you have to know it's going somewhere. It's leaking out... or leaking in.

4th Dec 2015 5:27pm

RILEY

Member Since: 01 Feb 2013
Location: United Kingdom
Posts: 35

sounds like pressurisation causing possible air locks hence sporadic cold heater had a rangerover do this ,turned out to be a cracked head

good luck with it hope I'm wrong one life, sell it

4th Dec 2015 11:58pm

gazman

Member Since: 17 Aug 2015
Location: Liverpool
Posts: 652

My td5 used to behave strange and do similar to yours. It was the expansion bottle cap. The relief valve was broken and vented constantly allowed the fluid to dribble out of the cap.
I had the car pressure tested and found a leak in the heater matrix but nothing else. Talking to the local indy they told me the caps sometimes fail. Mine has been fine since and covered several thousand miles 2014 - current ..... 2003 defender td5 90 (my car)
2009 - current .... 2005 zx10r

5th Dec 2015 2:29am

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