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jesperjes

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

2002 Defender 110 Td5 DCPU Java Black (black Hood)

Is it the water pump?

I have a 110 TD5 from 2002 with 250.000 km on the clock with the lack of heat inside the cabin. The engine itself and the needle in the dashboard behaves as it should.

I noticed that the hose that goes into the heater matrix is cold when the rest of the engine is warm. So I thought it was the heater which was blocked. I flushed the matrix. This did not change anything. So I took the two hoses from the heater and assembled them together, thus bypassing the heater. The hoses were still not hot, so the heater is not the problem.

I have found out that if I drive 90 km/h in 3rd gear then there's lovely crisp hot air in the cabin, but when I change up in 5th gear the heat disappears. But at 120 km/h the heat is back.

I have also changed the thermostat without success.

I can not find any constrictions in the hose up to the heater. So the only thing I can imagine that remains is that water pump is not working properly.

Does that sound reasonable? I can not see any leaks around pump (which I have read would be a sign that the pump is faulty)

Is there anywhere else I should look?

Jesper

7th Mar 2016 8:45am

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20447

I could be no longer working but doesn't mean to say it'll leak.
Has the air been bled from the system?

Last edited by custom90 on 7th Mar 2016 5:37pm. Edited 1 time in total

7th Mar 2016 12:12pm

jesperjes

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

Yes the system has been bleeded thoroughly, if that's what you mean.

The top radiator hose is hot and from the this a thinner hose goes to the heater matrix. This hose is hot a the junction and then decreasingly cooler on the way to the matrix.

7th Mar 2016 12:25pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20447

Sorry, yes I meant was the system bled. (Damned auto typing!

)

Is there any possibility any products have been added to the system and caused some sort of blockage?

It sounds as if the system isn't flowing, which I'd have thought would be pump failiure, blockage or air lock.

7th Mar 2016 6:05pm

jesperjes

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

I have a Webasto, but it's out of the system right now to see if it that had anything to do with it.

I guess I have to check the hose all the way to the matrix and if it's not blocked it must be the pump. But can the pump function only a "half rate" and then when there are a lot of revs it function 100%? That sound weird to me

7th Mar 2016 6:54pm

custom90

Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20447

I would imagine the Waterpump speed is governed by revs so I could have an affect yes.

7th Mar 2016 7:02pm

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