The bleeder screw is the highest point of the cooling system on a level ground so there is no reason to lift the vehicle
Most people overlook the screw which is probably why it seems "stubborn"
It won't be a mind blowing amount of bubbles that will come out but it's a good practice
All in all, it shouldn't take more than 30 minutes with cleaning up.
2 cycles is what I usually run the motor for bleeding
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