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BMW 540i Questions

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bought the used BMW 540i without owners manual .... appears to have no dipstick.
There is a knocking noise coming from the bottom of my car and when I push the clutch half way, I dont hear the noise again. What could it be?
I have a BMW 2000 540i and one of the keys I can use to manually unlock the car door, the trunk and start the engine but the other key doesn't work. It can unlock the car door manually but when I put the keys in the ignition the lights in the dash come on but if I crank it more the engine doesn't start. These keys used to work fine. Some time down the line the car's battery went dead.
Thanks
Purchased 1 week ago. noticed white smoke on start up. saw more smoke during stop and go traffic this morning. at lunch the car would not crank but tries to turn over. added gas just in case bc the hand was showing low but that did not solve this issue.
The problem is now becoming normal especially driving on hot days. Someone had mentioned to me, guard chain - OK, I don't know what that is, but I did the search. Can anyone help?
changed water pump and thermostat, and the front fan does not seem to be running .
my 540i 1998 is over heating and the fan may not be working any advise, it only does this when I am sitting in the drivethur
My window motor went out and I need to fix it. Can some one out there please tell me how to change the window motor by itself or do I have to change the regulator to.
I need help
Everything is working but there is no air coming out at all
Any ideas?
reveres will not work
WOULDNT TURN ON AND THE STEERING WHEEL, AND GEAR SHIFTER WERE LOCKED. CHECKED THE IGNITION IT WAS GOOD CHECKED FUSES EVERYTHING WAS GOOD. KINDA OF STUCK ON THIS SCENARIO.? ANY IDEAS?
Advised that the cost of replacing the upper timing chain cover gasket would be $1700.00. Is this a good estimate?
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