Overheating, how do you remove air pockets from the cooling system

If you did the same thing a week prior, the coolant is going somewhere, it cannot just evaporate from a closed cooling system. Inspect around/below the water pump and radiator for signs of a leak or dried white crust that would indicate a leak that is drying instead of making it to the ground. If no leaks can be found, you may want to chemical test it for a blown head gasket, not unheard of for these vehicles.
Here are a few guides on leaks, how to find them:

https://www.2carpros.com/articles/coolant-leak-symptoms

https://www.2carpros.com/articles/radiator-pressure-test

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

Check these out and report back with what you find.

I have replaced, with new parts, the thermostat and the radiator this month. Overheating still persists although less severely. What am I missing?

Flush the cooling system and check cylinder compression.

Range Rover 4.0 V8 123,000 miles.

I had overheating problems before so I changed the coolant, radiator and thermostat.

Although a bit better, the problem persists.

When in a traffic jam, with A/C running, the engine temperature slowly creeps up towards the red zone. At a certain moment the overheat problem kicks in, shutting off the A/C compressor, which stabilizes the problem. Highway driving is no problem at all, only when idling with A/C on

As soon as you start driving again, the temperature goes back to normal.

The system pressurizes well and the coolant level is stable.

Could it be a water pump problem?


Thanks

Mechanical fan? If so try a fan clutch.

Car overheats if driven for two to three miles but does not overheat parked and idling.
Thermostat looks to be okay. I flushed the system as well but problem persists.
I suspect water pump but do not know how to check if it is pumping.
If it is the pump I cannot get to all the bolts with the fan attached to the shaft. Can you please detail pump removal steps? Including how to get fan with clutch off the car.
Thanks

You do not look at the thermostat and declare it it is good. You have to test it or replace it. Cheap fix for the water pump see below:

One way to test for a bad water pump is to squeeze the upper radiator hose when the engine is hot and idling. Careful, because the hose will be hot! If you do not feel much coolant circulating through the hose when you rev the engine, the pump may be bad. The other cause might be a bad thermostat that is not opening properly (remove and inspect the thermostat), or a clogged radiator.