Is220d Heating Problem

[R9WLO]

Hi, first post here!

I bought an 06 plate IS 220 d this year and I love it.

However, as the cold weather starts to set in I have found what i consider to be a fault...can anyone confirm it as a fault and possibly what needs to be done to remedy it (i.e. is it a common fault?)

Firstly, after about 5 mins of driving a 'fan' kicks in that is very loud. It starts and stops intermittently.

Secondly, the heating system, when set to Hi blows cold unless I am driving at over 2,000 rpm. At this RPM it heats as expected (is sufficiently hot). The moment (and it is instant) i drop the revs to below 2,000rpm it starts to blow through cold air again.

It is not set to Auto, Dual or A/C and I have not experienced this before on any other car that I have owned.

Are the two 'problems' related? has anybody got any advice?

Regards

Jamie

[R9WLO]

I should add that engine temperature is fine - needle pointing around the half way mark.

A/C works fine

Blowers work fine etc.etc.