190E 2.6 Auxiliary Fan Not Working
 

Hello Everyone,

I own a 1992 190E 2.6. The auxiliary fans don't seem to be kicking on when the car runs hot. However, I ran a wire from each fan directly to the battery and both fans turn on, so I know the fans work. The temperature switch is new. Anything else that I can troubleshoot? Any help would be appreciated!

-D

Year?

Sorry, 1992.

Key ON
Pull plug off 2 wire blu sensor...
Does high fan come ON???

Can you be a little bit more specific? I apologize, I am not very familiar with this engine. Not sure what you mean by pull plug off 2 wire blue sensor??

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AO123CS42E00Y7KRH&year=1992&make=MB&model=190-E-005&category=R&part=A%2FC+ACC+Temp+Sensor&appEngines=_any

Unplug the sensor..does the fan come ON ????

with ignition on, fan does NOT come on when I unplug the sensor.

OK

Behind the fuse box are some relays ..look at the fuse on top of this one

http://catalog.worldpac.com/mercedesshop/sophio/image.jsp?title=Relay&url=http%3A//img.eautopartscatalog.com/live/P202070194OES.JPG

There are two relay switches made out of aluminum on top of the fuse box. There is space for three, but the right-most relay is missing! could this be the one you're talking about?

have a fuse on top??????????

No fuses, just a bare, square metal relay switch

You looking behind the fuse box???

You have to take a few screws out to get ther cover off..


Forget that for now..
On the a/c drier , next to the radiator, there is a sw with 2 wire pigtail lead ..jumper them together at the end of the pigtail connectors with the key On..do you have low Fan????

The fuse box cover attaches with a clamp. I looked around and could not find a cover with two screws!

Also, I tired jumping the two pigtail leads on the ac drier with the ignition on but the fans don't come on. That's assuming I did it right. I have very little experience with the 190e's

This the sensor you jumpered?

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AO123CS42E016GO8T&year=1992&make=MB&model=190-E-005&category=R&part=A%2FC+Temp.+Switch

That's it! It's attached to the a/c drier.

NOTE- Let's back up. Originally when you told me to unplug the blue sensor, I unplugged the wrong one. I located the right sensor and the FAN (the one on the left) TURNS ON

However, it still doesn't kick on when the car hits 100 degrees