My SLK is a 2001. The roof has been sticking when

I have a CLK 2001 and my rear window buttons just work normally when the roof is down. I can even raise a rear window without raising the front one.

https://www.mbusa.com/mercedes/service_and_parts/owners_manuals

the most common problem with those retractable hard tops are leaking hydraulic cylinders. check the insides of your trunk where the top down cylinders are located if there's a leak,and also check the level of the hydraulic fluid situated near the right brake lights.
in your slk manual, there are instructions on how to manually close the roof when the hydraulics fail.

The micro switches for the hard top latches are bad and not sending a closed signal to the control module. When they stop working the control module doesn't know the top is closed so it doesn't raise the windows. Those micro switches are known to go bad. I have changed quite a few of them before.

Ok, none of these people have an slk. chances ar your solinoid is leaking. it's pretty easy to change on this car given the size of the liner. trying to reglue prob won't work.

It could be an in-line fuse, which you would need to search for, out with the fuse box. Follow the wiring as it enters the driver area, then along to towards the motor for the roof.

I have seen this problem many times. One of your microswitches is either giving a false reading or fell of its retaining bracket. It is much easier to diagnose with a scan tool. My first guess would be that your retractable cover in the trunk lost it's switch input. Check the switch that is contacted when your cover is pulled out. If that is o.k. look inside the hard top deck lid cover very carefully and you will probably see either a broken wire or a loose switch. You may have to manually close your top becuse the switch inputs are illogical. Your manual will tell you how to close your roof.

This symptom almost always points to a mechanical issue, not an electrical one. The SLK hardtop is notorious for needing to be lubricated every couple of years. Here is a link with directions and photos:

http://www.benzworld.org/forums/r170-slk-class/1426014-lubing-vario-roof-pics-1-krytox.html

Sticking joints are the most common culprit to intermittent raising and lowering problems. Once those have been lubricated and that has been checked off the list, then consider looking into electrical issues.

The moisture from the rain may be helping to lubricate these joints and that might be why it works fine in the rain...

Mark Andrews

This symptom almost always points to a mechanical issue, not an electrical one. The SLK hardtop is notorious for needing to be lubricated every couple of years. Here is a link with directions and photos:

http://www.benzworld.org/forums/r170-slk-class/1426014-lubing-vario-roof-pics-1-krytox.html

Sticking joints are the most common culprit to intermittent raising and lowering problems. Once those have been lubricated and that has been checked off the list, then look into electrical issues.

Mark Andrews

This symptom almost always points to a lubrication issue. The SLK hardtop is notorious for needing to belubricated every couple of years. Here is a link with directions andphotos:

http://www.benzworld.org/forums/r170-slk-class/1426014-lubing-vario-roof-pics-1-krytox.html

Mark Andrews