Bmw power windshield go down and not up most of the time

7.8L is the marking on the windshield wiper fluid reservoir and had nothing to do with the engine. With this level of competence, please do not attempt to replace the timing chain. (they're aren't any timing marks, btw)

Have you checked relays and the fuses

Hi mario,

Stand by the washer reservoir under the hood while someone operates the washers. The headlights must be in the on position for the sprayer to work. Attached to the reservoir will be 2 washer pumps. On pump is for the windshield washer, the other for the headlight washer. They are interchangeable for testing. The reservoir can be removed after removing the 2 black speed nuts. (use a 10mm socket and ratchet). Also make sure the grommet with screen under each pump is not full green algae. Your pump has most likely failed.

That's just some deposits from the water. The minerals in the water are crystallizing in the lines due to heat from the motor. use a strong uncut windshield washer fluid and give it time to clear out.

TURN OFF RADIO FIRST BEFORE DISCONNECTING THE NEGATIVE BATTERY CABLE BUT.THATS NO GUARANTEE YOU WILL LOSE RADIO CODE I WOULD TRY TO USE A BACK UP MEMORY SAVER YOU PLUG IN THE CIGARETTE LIGHTER BUT NO GOOD IF CAR GOING TO BE DOWN LONG.TIME BECAUSE THE MEMORY SAVER BATTERY WILL GET WEAK YOURE IN TROUBLE.BMW WARNS IF YOU DISCONNECT BATTERY CABLES YOU WOULD LOSE HEATING COOLING CLIMATE CONTROL.YOU ALSO WILL LOSE FUNCTION TO WINDSHIELD WIPERS AND WASHER , CENTRAL LOCKING AND THEFT SYSTEM CONTROL.

there is a small alan screw in the base of the backup mirror. loose it and slide the mirror back on to teh base on the windshield and tighten down the alan screw.

open hood.
there are two, one on each side up near the windshield. pop down the locking "bar" wire thing, and take a 13 mm socket, and unlock the half turn hold down lock. then remove the micro filter housing, replace the filter, and reinstall. it's an easy job

I would think that the motor for the window needs to be replaced, as for the windshield cost, that depends on the model of the car and where you go to have it done, I would shop around and compare prices in local business' first.

depends on what type of top you have (full power or power assisted).

if power assisted, then release the latches on the inside where the top meets the windshield, then hit the button on the lower dash (its near the button for the heated seats & traction control). it has a picture of a side window & top on it. pushing it one way lowers the top. you have to be in park (or drive with foot on brake) to lower it. hold the switch down, the side windows will lower a bit and the top will begin to move. keep holding it till the top tucks under the boot and the windows begin to go back up, then release it. if the light on this button is not flashing when you release it, then the top is tucked away properly. if still flashing, then keep it depressed until the top folding sequence is complete.

if a fully automatic top (you will not have latch releases on the top where it meets the windshield), then simply hit the button as described above. no need to push on the top during the beginning sequence. keep holding it until the windows begin to go back up, then release it.

for both, watch the top as it tucks into the boot. sometimes if the top is not properly aligned, the top cloth may not tuck correctly and may require some help from you. the sequence can be stopped any time, but the red light on this button will flash.

to put it back up, simply hit the button in the opposite manner and the sequence will start with the rear boot lifting up first. fully auto tops will lock automatically to the windshield. power assisted tops will require to lock the top. if red light on this button still flashes when released, then the sequence is not complete or has encountered an error.

hope this worked for you.