Remover of blower motor

i'd guess the overrun is normal in the continuous run mode. blower switch is im continuous mode?

It looks like this should help:

Where is the relay for airmatic suspention pump on 2000 Mercedes S500

If pulling that out and putting it back in doesn't help, here's some more troubleshooting info:

2000 S500 airmatic problem Mercedes Forum Mercedes Benz Enthusiast Forums

The dealer has some problems with these I think. Bad fuses and such. Check to see if the blower motor is getting power after you turn it on. Check to see if the resistor block (in series prior to the blower motor) is good.

your blower motor going bad or blower motor resistor

Remove the passenger side, lower dash cover under the glove compartment that conceals the blower motor. A 1/4-inch socket will be needed to remove the screws holding the cover. Locate the blower motor. The motor can be seen hanging down close to the passenger kick panel, disconnect the electric to the blower motor and then remove the screws that secure it to the ducting, drop blower down and out from under the dash. I would test the blower first with a 12 volt jumper cord from the battery made out of house lamp cord, it is not usually the problem but the blower speed control module that is next to it.

the blower motor for the a/c is located under the windshield wiper motor. you access it from the engine compartment by removing all the trim covers under the windshield, also have to remove the wiper motor and assembly but be careful not to crack the windshield. once you pull all the covers out of the way you will see the blower motor housing. remove clips and voltage regulator in order to remove top cover of blower motor housing.

Under the front of the car on the engine compartment should be nuts that you can remove to remove the cover.

Slide catch on top of key to remove emergency key
Use this or small screwdriver to prise off top cover of key to see battery

Not 100 percent sure on the 2000 model, but on the late 90' models the blower was located under the hood, under the plastic panel located close to the windsheild...tg

If you have a owners manual then the method is described there.