2010 RRS 3.0l
diesel
RHD UK

I have been working hard to work out what the actual fault is regarding the interior heating.
I believe i can rule out the heater control valve as hot water is getting to the matrix.
Dial is set to hot
Cold air blowing on left hand side through all vents.
Hot air coming out of dash vent in middle yet only warm air blowing out on the window vent drivers side.

Rear heating:
Left side blowing cold
right hand blowing warm.

Matric has the two aluminium pipes in drivers foot well. Both pipes very hot.

What is the problem?
Core needs blasting out or door blend actuators?
thanks

Hi I have a similar issue on mine and when I scanned it it said blend door / flap motor not functioning so I would guess it would be the motor/actuator has failed the same as mine. But I have yet to change it.

I have that as a possible next stage. The dashboard has to come out to change the acuator. i believe mine is working correctly. The control valve is a common problem and as mine is 2010, i am going fr the easiest fix and hopefully that is the problem. If i have to look at the acuators then i just as well change the matrix whilst there.
thanks

I made a kit up to blast out the heater matrix on the sports and d3 cars, they use exactly the same heater matrix. As you have heat 1 side and not the other give it a good blast with air and water mix I bought a gun off the bay that connects to my garage air tank and water hose a quick blast and it solved the issue.

You can also swop the flow and return pipes at the rear of the bulk head to reverse flush it with normal cooling system pressure if you cannot rig up a flush gun .

i will try the reverse flush. good idea. I am tempted to buy a garden pond pump to try it as well.
can you tell me where the heater control valve is situated on mine?
thanks

Hi,
I've just bought a 2013 l320 HSE sport. Driving home I thought I had a window open. After messing with controls I found:
Out of the four forward vents I have only heat out of the vent between steering wheel and touch screen, other 4 freezing cold.
Feet blower on drivers warm and passenger cold. Windscreen, drivers warm, passenger cold. Rear seat blower. Drivers side like warm, passenger freezing cold.
What do you think this is ? Heater matrix or blend actuator? Is it dash out to fix both these ? Or is there a way of cutting away behind to change either ? Rhd UK car, I'm in west Yorkshire fyi.
Thanks

you have the same what i have. there are four possibles i have found, matrix, actuator and heater control valve. I'm going for the heater control valve first if i can find out where it is fitted exactly. The actuator and matrix is dashboard out for both, hence why i am trying the easier method first.

Cheers for the reply.
I've had mine plugged in and showing no faults re blender actuators.
Spoke to the owner of mpb landrovers West Yorkshire and they said they do loads and my symptoms are blocked matrix if no fault codes.
Booked in on Monday for it changing, will be approx £650 all in., dash removal as 2013 model.
Hooe there are no more surprises, only owned it 24 hours 🥴

Would heater controller valve show a fault when scanning??

£650?
cheapest here in london i found was £1000. might be wrth a drive to your garage and stay in a hotel for the night.