Where do I add windshield washer fluid on the mercedes 320

There videos on this on you tube .

Here's a video showing you how to add windshield fluid,will make you watch a commercial,lol. Add Windshield Washer Fluid Mitsubishi Montero Sport 1997 2004 1997...

it locate in tthe bottom of windshield water reservoir(tank)

If you are talking about the headlight washers, all you need to do is drive the car with the headlights on and press the windshield washers. It will push fluid onto the headlights and the windshield at the same time.

add the transmission fluid in the same tube where the dipstick is locate, add a pint at a time before rechecking

The most common problem I find in this season, is having summer 32 deg. F freezing windshield wiper fluid in the tank rather than -20 deg. F freezing windshield wiper fluid.

Try to warm up the car by parking it in a heated garage until the windshield wiper fluid thaws. Then, try to use it all up, and add the 'winter' vs. the 'summer' formula of windshield wiper fluid.

If this does not solve the problem, the pump might be burnt out, in my experience.

You should hear a humming sound as you depress the button for windshield wiper fluid inside of the car.

Good luck on this repair.

It is the same for any mercedes. here is a copy from another source on the internet

Interior
· Function check
· Check warning and indicator lamps, illumination and interior lighting
· Check windshield wiper, windshield washer system, headlamp cleaning system
· Reset maintenance service counter in instrument cluster

Wheels, brakes
· Check front brake pads for lining thickness
· Check tires for damage, condition
· Correct tire inflation pressure

Engine compartment
· Change engine oil and filter
· Fluid level checks of the following:
· Engine cooling system, antifreeze and corrosion protection
· Windshield washer system
· Brake system
· Check and correct battery fluid level
· Check battery condition
· Check catch, safety catch and hinges on engine hood for proper operation

Trunk
· Correct tire inflation pressure in spare tire
· Check battery condition

Well you can pour hot water in the resivor, and when it melts, make sure you use it, till it runs dry...And then make sure you put the proper windshield washer fluid in the resivor...Do not add any water...because your typical fluid will not freeze...but when you add water, it will freeze...

When you pull the lever to activate the windshield washers, do you hear any type of sound coming from under the hood?  A whirring sound should be heard from the little electric pump that feds the washers.
If you can hear the whir, then you should look for a possible clog in the washer hoses (there is more than one...).
If you cannot hear the whirr, then you should check the fuse that protects the windshield washer circuit.  Check your owner's manual for the location and correct amperage for this circuit.
Good luck!