Disco 2 Heating issue - heating core cleaning?

Hi Guys,

My D2 4.0 FL has been getting some good treatment for Christmas but, as "$%ing usual, it had development ills and aches subsequently.

One of the issues I`m trying to attack is that, after changing the water pump and coolant, the heating in the car is not working properly - the air is only luke-warm when revved up to 2,500rpm (or so) for about 30 seconds (or so).
The two pipes going to the heating core are warm.

Shall I replace it (if so, what buck would I be expecting to pay? Are these compatible with TD5?)?
or maybe I can simply clean it...
If someone could kindly point me to the thread where that was discussed I`d appreciate.

Hi. It's for Td5 but the principle is the same: https://www.landyzone.co.uk/land-rover/discovery-2-coolant-flush.325432/#post-4171036

Thanks for the links guys!
I`ve got error codes (after trying to get rid of an airlock)
P1668
P0155 ; P0135 ; P0154

Off I go for sensor shopping and youtube-instruction searching.

Stanleysteamer said:

https://www.landyzone.co.uk/land-ro...n-and-heater-not-working.365241/#post-5008999

Click to expand...

I shall have a read

sierrafery said:

Hi. It's for Td5 but the principle is the same: https://www.landyzone.co.uk/land-rover/discovery-2-coolant-flush.325432/#post-4171036

Click to expand...

And here too

sierrafery said:

Hi. It's for Td5 but the principle is the same: https://www.landyzone.co.uk/land-rover/discovery-2-coolant-flush.325432/#post-4171036

Click to expand...

I`ve went at a bleed screw again - 1500rpm, bubbles, retighten bla bla bla

Now the air is much warmer now.