Do I put antifreeze in the radiator also
Not sure about the Range Rover, but on my 95 Discovery 3.9 there is a small plastic plug in the top left of the radiator (if youre looking at the front of the vehicle) that is removed with a socket. You should always fill the radiator through that plug until all air is purged from the cooling system, then fill your reservoir.
Make sure to get the correct type. For that old of car it shouldn't be anything but it's worth making sure you get the correct stuff.
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