Be careful adding too much straight antifreeze - you should dilute it 50%-50%water. Not that it matters too much "IF" you have the lower hose replace in the near future but you wouldn't want to keep topping it off and create a high antifreeze level as it does not cool as efficiently and obviously your leaking somewhere and little critters that lick it up will likely die - it's very toxic but smells and tastes sweet.
The prices listed below are on www.RealOem.com Most Dealers do charge more - a rare few charge less; don't know what the core value is worth Don't know the suggested labor but not likely cheap just because it's the stealer. If you had a lift or jack stands and could remove the lower plastic panel to gain access you might be able to do it but there are ways to remove the fast release couplings on the hoses - you could look at the new one/s to see and give it a shot, there should also be o-rings which likely come with the new hoses but you certainly need them and definitely wouldn't want to use your old ones (probably what needs replacing anyway). You'll need to collect all the antifreeze as it will rush out when you pull the hose off the lower radiator. Replace hose in reverse order, don't know if you can clearly access each end of the hose for easy replacement so look before disconnecting anything.
Here's what BMW says to do prior to filling coolant back up:
Before filling, turn on ignition (don't start engine). Set blower to low level. Seat heating controller to maximum temperature. This ensures that the heater valves are fully opened and the auxiliary water pump starts up. This will allow the air to escape and enter the hoses - in your case you don't know if all these are working so bleeding success will vary accordingly.
Production up through 2/05
The supply hose which looks octopusish 17127526954 $87.15 +core
The hose with a temp sensor is the Return Hose 17127508011 $43.58 +core
Production after 3/05
The supply hose which looks octopusish 17127535742 $87.15 +core
The hose with a temp sensor is the Return Hose 17127508011 $43.58 + core
Temperature sensor 13621433077 $25.03
Last edited by Bimmer750LI; 12-27-2009 at 08:32 AM.