New in the Volvo family, with a few small problems

Moin, I have been the proud owner of a V70 I 2,4T AWD Bj. 99 for 2 months and so far also very satisfied with the vehicle. I would like to eliminate the flaws that he has and hope it is okay that I get this collected here: The blower spins every time after the ignition is switched on the blower engine goes off fully and after 2 seconds again. After that it no longer goes on and the switches of the climate flash. The blower motor sounds a bit rough, when the expansion has ic h but determined that the wheel has no play and easily turns. The topic was already here often and it will probably be the bias (or?), but still I would like to read the error before. I have an OBD 2 socket in the middle armrest – can I read out the ECUs via a USB/OBD cable? (For information: It is a Volvo that originally comes from Switzerland) Headlight cleaning does not work There is no wiping water and it seems as if the wiper blades are Pushed down (that is to say, rotate practically wrong around). What could this be about?Wishwater does not come to the rear window I mean to hear a buzz when I press the button. Where do I have to look for whether hoses have gone off? Under the rear flaps paneling everything looks obviously normal. Is it now that the V70 I has only one wiper water engine? Because it would then have to be fine, since the windshield comes to wiping water. cht completely got through, whether now 850 or V70 is meant when talking about 2 wiper water motors for vo/hi. I would be very happy about advice and help!