Member Since: 22 Feb 2013
Location: Northants
Posts: 889
Heater issue
Hi peeps. I’ve read a few threads about heaters blowing cold on one side and wonder if I have a blocked matrix or a motor flap issue. The passenger side blows warm and the drivers hot.
Is it worth trying the back flush method first? Should I use a cleaning agent? Also, what coolant do I need to top up with? Is it oat that has to come from land rover?
Many thanks in advance. Steve.You remind me of a younger me, not much younger mind...perhaps even a little older!
28th Apr 2019 10:01 am
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 889
No body done this? Can any one tell me which is feed and which is return please?
Thanks. SteveYou remind me of a younger me, not much younger mind...perhaps even a little older!
1st May 2019 8:53 pm
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 889
I had a chance to check today, but not to flush.
When I set both heater controls to low, the blend motors show maximum cold, but when on hot only show intermediate.
Is this right? I would assume it should show maximum hot or something of the like and intermediate anywhere in-between. With the air con on the passenger side blows cold when on hot, luke warm when ac is off. Driver side seems ok but not as hot as id like.
Im assuming that both blend motors are not fully actuating, passenger worse than driver.
Is there a self test calibration function like on the d3.
Any help greatly appreciated. Cheers.
SteveYou remind me of a younger me, not much younger mind...perhaps even a little older!
11th May 2019 3:58 pm
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 889
This is what the live data shows.
Can some one please confirm which hose is the inlet and which is the outlet, and if indeed these are the hoses??? They will be a right to get to.
You remind me of a younger me, not much younger mind...perhaps even a little older!
11th May 2019 4:23 pm
Oswiperus D3 Decade
Member Since: 02 Apr 2010
Location: Chelmsford, Essex
Posts: 1600
I'm pretty sure the inlet is the drivers side of the 2 hoses but should be able to feel them warm up to prove it.
Not had the problem yet but it appears always to be cool on passenger side when matrix is silting up on both D3 & D4 from reading post over the years.
Certainly worth a go at back flushing but people have managed to change the matrix ok I believe.Stu
2016 D4 Landmark current
2022 Defender D300 SE Gone
D4 2014 XS Commercial - Gone
D4 2016 hse lux montalcino red - Gone
D3 2005 se java black - current
D3 2005 base manual - gone
D2 1999 TD5 E white - current
11th May 2019 8:49 pm
sasdiscos
Member Since: 22 Feb 2013
Location: Northants
Posts: 889
Just an update, I flushed the heater matrix both ways, with cold then hot water. I used a rad cleaning solution and flushed several times with fresh water and compressed air. Got quite a bit of crap out.
Works much better now.
SteveYou remind me of a younger me, not much younger mind...perhaps even a little older!
20th Jun 2019 6:33 am
Oswiperus D3 Decade
Member Since: 02 Apr 2010
Location: Chelmsford, Essex
Posts: 1600
Result! Stu
2016 D4 Landmark current
2022 Defender D300 SE Gone
D4 2014 XS Commercial - Gone
D4 2016 hse lux montalcino red - Gone
D3 2005 se java black - current
D3 2005 base manual - gone
D2 1999 TD5 E white - current
20th Jun 2019 6:58 am
ncant1987@gmail.com
Member Since: 13 Dec 2022
Location: Norfolk
Posts: 3
sasdiscos wrote:
Just an update, I flushed the heater matrix both ways, with cold then hot water. I used a rad cleaning solution and flushed several times with fresh water and compressed air. Got quite a bit of crap out.
Works much better now.
Steve
^^ Hi Steve,
Appreciate this thread is pretty old now, but just looking to see how you did the flush on the heater matrix! Can't find any decent youtubes on it anywhere!
Cheers,
Nathan
13th Dec 2022 7:22 pm
TheBrownHornet
Member Since: 18 Mar 2013
Location: Perth
Posts: 4
Hi Nathan,
No intention of stepping on the OP's toes.
I recently flushed mine with remarkable success.
I used a commercial product by Airboy called a Jet Flusher that used a mix of water and compressed air. Have seen home made solutions on this forum that appear to have worked equally well.
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