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 .