My land rover has over heated. What can it be?

Usually people check everything, change the thermostat and forget to check if the cooling fans work? The other possibility is that the water pump is failing.

The simplest thing would be if there is a big air lock in the system and the water isn't circulating properly. No heat coming out of vents is a symptom of that because the heater core is high up in the system behind the dash. Read this Tip I wrote. Raising the front of the vehicle is important to fill the heater core as well as putting heating on MAX.

https://www.fixya.com/cars/r29872074-vehicle_cooling_system_no_heat

Why is My Land Rover Overheating? ' Service Tips in ...

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What to Do When a Car Overheats · Turn off the air conditioning and crank the heat up high. This will help remove heat from your engine block. · Pull over and ...

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.. Not sure how the transmission video got in there but I can't remove it!

Engine cooling fan or heater fan ? Heater fan switch may be bad or engine cooling fan relay may be stuck closed .

make sure that thee is sufficient coolant in the system
check that the controls are opening the heater tap for water circulation

When is the last time you change the thermostat and coolant?
Recommended interval is 2 years.

Coolant is the heat carrier to heater core.
Top off the coolant level for now and re-test.

Check to make sure the Fan is working properly, if you have electric fans check to make sure they come on when vehicle is over heating.

cooling fan not coming on

You put aftermarket seats in a Land Rover?
Recommend you contact your seat supplier.

Sometimes their are other fuses hiding outside the fuse box. above and beside it.

it could be the head gasket gone very common with alley heads