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Im in agreement with Bret I would suspect a blown head gasket. Replace the resorvoir and cap and if it still pushes coolant out and/or overheats start looking toward a head gasket replacement.
There is no round plug on the E65/66. You need to use the OBD connector located in the left kick panel.A capable scanner should be able to access the needed modules from there.
I would start by towing the car to another shop. Have them perform a block test on the cooling system to detect combustion fumes in the coolant. If that checks negative, have them pull a vacuum on the cooling system and fill that way. The head gaskets on the 6 cylinder cars doesn't suffer overheating well and may have blown. The shop will need special tools to retime the engine properly if the head has to come off. Hope this helps some.
Sounds like one of the microswitches for the top is defective and not registering the top as closed. Also there could be software updates. The dealer would know about those.
Check the condition of the CV axles
Most likely a weak trunk lid shock. These are located behind the hinges of the trunk (toward the front of the car) lid and run parallel with the deck lid.
Fortunately the X-Type is a fairly simple car mechanically. I would recommend buying a repair manual that either is vehicle specific or covers basic maintenance. Not that you can't figure it out but with oil you don't want to forget something and screw up that engine $$$$
If the power operated window(s) will not fully close, it has to be re-initiated. Procedure for re-initiating is as follows: 1) Engage the auto-down function and remove fuse 27 (11C/27) during the window movement. 2) Install the fuse in position 27. 3) Engage the auto-up function and hold it engaged for 5 seconds after the window has reached its fully closed position. 4) Check the window function after performing this action by opening the window at least 20 centimeters ( 8 inches). Engage the auto-up function and check that the window will go all the way up, (closed position) by pulling the button once again. The auto up function will be engaged if the button is pulled to the second step and the auto down if the button is pressed to the second step.
Not sure what fuse 11 powers but if this happened after hitting something I would check the wiring under the car for damage. Maybe a wire got pinched and is now grounded to the body. Also check forums for similar issues and see what others may be experiencing. I know it's not much to go on but it may be a start.
Sounds like the car is running hot. Check for proper thermostat operation. Also make sure the radiator cap is in good condition. If both of these checks out then a shop may be able to check for a faulty water pump, clogged radiator, or worse case a blown head gasket.