Alarm keeps going off on my 1998 merc slk 230 kompressor.

Go to this website and look it up. www.rockauto.com

check the gear box fluid levels this is usually the cause of most merc faults on the box

Check the fuse link.

I have a 1998 SLK230 and I can't adjust the vents for cool air. It only comes out hot. Could this also be related to an inability to lock or unlock either door form inside or remotely?

thanks

First check that you have oil on the hydraulic pump that it is inside the trunk on the rear right fender the oil should be between the marks. If thats ok check when you put the ignition on if the switch that operates the roof is on, should be off, on means that something is wrong, if blinks 6 times one of the 5 or 7 switchs are not closed, check one by one. check the two that close the trunk at the middle, the cover, the trunk limit switch, the trunk switch

check head gasket. well first run a compression test

There are many parts places. We are here to help you in repair not finding parts.

You don't say if you want used or new parts. The Kompressor car is a very complicated automobile and most likely well above your expertise so please be careful if you intended to attempt this repair at home as one slight misjudgment and the turbine can be ruined for life.

I would just google for the part you need.

this sounds like a door switch not switching if you shut the door and left your kyes inside the car the door locks would pop up so you cant look yourself out,,,(but you can?) my money is on a door switch,, give them all a good swilling with WD40 to free them off if this dont fix it then its the car alarm it needs to be reprogramed to the kye fob and also fit a new battery to the kye fob at the same time people often forget how much work the kye fob needs to do and only when it stops working do they change the battery in it,

I had the same problem. The window goes up to high because a L shaped bracket has come off the window.This bracket basically restricts the height of the window. Take the door panel off retrive the bracket that is roaming free inside your door and glue back on.There are 2 brackets both glued to the window.one sits on the outside of the window the other ontop of that but inside.Use a strong glue otherwise it will keep happening. To anwer the first point the window is not supposed to go down.