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BMW 645Ci Questions

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It's the system box in the on the passenger side and something leaking, the AC is blowing hot and the AC lines are hot. Can someone give a price on repairs
The battery goes dead if it isn't driven for only 2 weeks. I had the alternator checked by 2 different auto electricians and I'm told that the alternator is charging. Additionally, no ground shorts were found that would draw down the charge. My question is this--can an alternator or voltage regulator fail intermittently or do they work fine until they go?
owners manuel says use a brand approved by bmw
It recently started happening. Doesnt do it all the time. Also i recently purchased the car 3 months ago and it does not have the original size battery but it has been running strong.
It will start sumtimes and then others it want
I ordered a new key from BMW but they were unable to program it (and of course they want me to make a costly service appointment). Could the transmitter receiver be bad? Is there a fuse for said item?
Any insight would be greatly appreciated.
car disp[lay keeps going on and off also does the the passenger light oring
It was in a accident but it was just repaired ....plus its condensation in the light fixture
2 years ago the dealership replaced condensor, compressor etc.. A/C worked good for 2 years althought havent used it accessively in the past summer seasons. I recently added R134A , autozone. 44dollar can w/pressure gauge.. The a/c came on cold for only two days, then started blowing hot air again.checked climate settings and its ok
I have checked the fuses and disconnected the battery several times but the top will not go down. The navigation screen says "top not locked". We used the allen wrench and manually tried to lock/unlock to no avail.
I was told that they needed to put an expandable pipe in ?
It won't pass emissions so I need to LOCATE/REPAIR to 3 bad sensors.
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