2011 bmw 328i

When you disconnect the battery, it causes the anti-theft system pairing to break. On reconnecting the battery, the key and transponder chip need re-pairing. There are some ideas in the link, but with a BMW your best bet is to call a mobile auto-electrician or an auto locksmith. They both have pro grade scan tool computers that can reset the anti-theft system and diagnose any other electrical issues.

https://www.google.com/search?q=2011+bmw+328i+reset+anti-theft+system

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What was the problem before replacing the battery? did you confirm that the battery was bad? What are the "issues" you are having?

I do not know of an "Air Pump" for a 1996 328i. Did you mean
fuel pump (15A fuse # 18) or
blower motor (30A fuse # 20)

If the temperature control is on cool....sounds like you have other problems with AC. ( compressor not working, needs R134,) Check under the hood for a box that has fuses in it, their are also relays in it. Look for the relay marked AC.

You cant just flush the core, youre going to have to flush the whole system. There is a kit but i recommend going to a lube shop. Another cause could be the radiator cap.

For car running hot and overheating issues,i suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems :----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

You will need to test for power at the ac compressor, with ac on there should be power at compressor for the clutch,

check fuses check fan switch and finally check fan motor may need mechanic or auto elec

hi lisa, this looks like an electrical problem, if out of the blues the ac unit stopped working. check the following
ac fuse inside your car ac fuse outside under the hood check fuse for fan as well
hope i helped thanks

I have 1998 BMW 328i and it shut off entire air condition system while running. sometime it works fine then suddenly it shut off while driving.