Thanks guys for some suggestions. I found a thread describing two ways of cleaning the clogged washer jet system:
http://f30.bimmerpost.com/forums/showth ... ?t=1235500.
I did not want to remove the pump so I decided to choose second method:
2. Leave everything as it is, use a small amount of Mr. Muscle drain unblocker in half a pint or so of water & put mixture into the washer bottle. Activate washers for a few seconds then leave it half an hour. Get a hose pipe ready... Activate washers again. The blockage should have cleared & nozzles back to working. Run the washer bottle empty straight away & refil with hot water. Activate washers to flush any remaining drain cleaner away. This is where the hose pipe comes in... Blast away & thoroughly drench everywhere on the outside of the car to get rid of all traces of where the drain cleaner has been. This must be done immediately & thoroughly. Then you're good to go.
My car has got ceramic coating protection but I chose to follow steps today as it is raining outside and also used a few buckets of water to make sure "Dettol Power and Fresh mixture" does not remain on paint.
Unfortunately that did not help. Moreover I can say that wipers also stop working at that time.
I wish I could ask BMW specialists how wipers and washer jet pump work together - based on my experience with a dealer I am afraid they would not tell me that, but
I can say now that restarting engine does NOT help.
I have created an album that presents washer jet system under the bonnet:
https://photos.app.goo.gl/6a9PiGUcKr1L7yQo2
If you see something different to your E89 - how the pipes are mounted - or simply something wrong or strange, please let me know.
You can see on this picture:
https://photos.app.goo.gl/NbQCUGsxRCTTuYE52 that the pipe is mounted quite tight, nearly squezed (the last holder/band).
I can provide more pictures if you need any.
Does anyone have any idea who would be able to diagnose the problem and fix it in Newcastle upon Tyne or nearby?
ps. I am going to go with "my baby" to a petrol station to
disconnect the hose by the jet (pulls out) and then used tyre inflator to blow air down hose..
and maybe also
.. back to bottle.
Z4 E89 2.5l (Straight-six engine). M Sport.