I am sure there are hundreds of posts about this, but not sure if my same problem is related. I have a 1985 380SE and my fuse for the auxillary fan keeps popping instantly when it is time for the fan to come on.

The PO had installed a 25 amp fuse and it was only supposed to be 16 amp! How stupid is that! Even the 25 was blown.

What things should I check first? Thanks in advance!

The first thing I would look for is a locked up fan.If the fan turns OK then unplug the connector by the reciever/drier and try another fuse, If the fuse dosen't blow the the fan is bad.
Mike

Thanks. I did check the fan and it turns freely. From the looks of it, it has not worked for a very long time. I will check the other things you mentioned and report back soon.

And if I disconnect and the fuse still pops?

I went out and tried to disconnect, but could not get it to come apart at the connection there. Is there a clip on that connector that has to be pushed in? I noticed something on one side of it, but it does not appear to be anything that has to be pushed, etc. I am guessing I should just use a little more force? If its not the actual fan motor, what else could it be?

BTW- if it is indeed the fan motor on the fritz, about how much $ are we looking at? Probably $$$ I suppose?

Also- will a fan from a 300D or 240D (78-85 era) also work? I am wondering what all years are compatible, incase I have to go the salvage yard route, which I probably will do anyway.

Hello? Has no one ever had to change their electric cooling fan?

Another one of those "its only a problem on my car" deals?

Well, at least it is not a big deal. Temp only goes to about 110°C in the hottest city driving. Whats the worse that can happen? Blow a head gasket?

Thanks

My car's a lot more junior than yours (87 190e). Check if your engine temp sensor is in order (I think yours is 3 pole geen).

1. Take it out, shake and see if it rattles. If it does, it's busted.

2. To check if the fan is working, unplug the switch and short the holes on the plug. 1 is ground and 2 connects to the fan relay which activates the fan. Of course do this with a fresh fuse.

Try step 2 first, since it's a lot easier to do.

Good luck.

Thanks. I will check that ASAP. I have to work for the next 3 days, then I will be out of town for the next 4 days (Friday thru Monday), so it will probably be Tuesday before I get to check it. Not a big deal now, as it is cooling down into the 80s for highs and it (engine) does not get that hot when it is in the 80s.... When in the 90s, it is borderline.