08 X5 does not have bleed screw... with the electric water pump there is a procedure to do where it bleeds itself electronically.

Naturally leave the hood open and radiator cap off for conformation the bleed procedure starts. Here's the steps...

1. Key on, engine off (do not run engine before doing bleed procedure after coolant change, will overheat)

2. Put heater at hottest temp setting at lowest fan speed, with ac compressor button off.

3. Press gas pedal down all the way (past click point) for about 10-12 seconds.

This should have activated the electric water pump so go look in the radiator cap opening for a stream of water pissing across. If that is happening the bleed procedure has started. It runs the pump in various speeds from 0% to 100% over a ten minute run where it opens and closes heater valves and the thermostat etc. to push all the air from the system.

You should try this procedure first before doing the coolant flush to make sure you can get it to run, it doesn't harm anything to run the bleed procedure and you can stop it anytime by just turning off the key or starting it up.

Also as an FYI, there is no drain plug for the coolant either, just take the lowest hose end loose at the passengers front corner with the plastic underpanel removed for access.

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2003 4.6is