I have a 2004 Land Rover discovery I have bled the coolant system multiple times however there is still an air pocket somewhere? It will overheat When I am at idle, I have to turn the heat on in order for it to stop overheating could it be a fuse for a fan that’s not turning on when it’s getting hot? I also replaced the radiator about two years ago could it be a clogged radiator? Please point me in the right directions to diagnose this problem I also have a little bit of sloshing coming from my dashboard. last week I also replaced the heater plate on my throttlebody that was leaking i’m sorry if I posted this to the wrong thread I am new to this forum thank you! There is also no coolant leak that is visible (edit) The truck was sitting for five months without being driven I was driving it back-and-forth 30 miles to and from work every day without these issues before it sat. when I started driving it two weeks ago again these problems started I was having family members turn it on and let it run for about 20 minutes once every week when I was gone for five months

 

Sloshing sound coming from the dashboard is a typical indicator of trapped air.
Try looking in the Disco 2 forum rather than the general forum. Hundreds of threads there about dealing with overheating and bleeding the cooling system.