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#1
07-20-2006, 02:03 PM
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Only One Aux Fan Coming On??
Hi all,
I noticed today when I was charging the A/C on my '91 300E that only one of the two aux fans was coming on when the A/C was turned on. It spins freely by hand and the other one works perfectly. Any ideas? There isn't some kind of relay for turning on one & not the other, is there? I thought they were switched together... Thanks!
__________________
Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress 
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#2
07-20-2006, 02:31 PM
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You are correct...they are wired together...most likely a bad motor
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
07-20-2006, 03:15 PM
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One of mine did that. I took it out and apart and found the brushes had hung up. I loosened them up, lubed them, put everything back and its been spinning ever since.
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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots) 5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others) 5 speed '01 Jetta V6 (new wifes car, pretty quick) 5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k ) 5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest) 0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)
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#4
07-20-2006, 04:04 PM
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Give it a whack with a rubber mallet while the other one is spinning. If it tries to start up or actually starts up, you have confirmed that the fan in question needs replacement.
__________________
'96 C280 (gone) '97 C36 '05 C230k
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#5
07-20-2006, 06:14 PM
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Anyone have any brilliant ideas on pulling them?
Or should I just expect to pull the radiator/condensing coil... Thanks!
__________________
Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress
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#6
07-20-2006, 08:01 PM
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It's not that tough to R&R the fans. You basically just remove the fan shroud. Remove the clips that hold the radiator and the condensor.
This allows you to lean the top of the radiator back . Now just look at the framework and remove the bolts. Several are a little tough. While you are in there clean out the mess of debris and bugs at the lower portion of the condensor. Just did this job about 5 months ago. I had one dead fan, which I replaced. Disassembly of a dead fan looks to me to be very tough. New ones are only something like $120.00 on the net. Steve
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#7
07-20-2006, 08:03 PM
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Arthur,
I checked the wiring diagram and saw they were in parallel, unlike my memory, and deleted the post, but you were too quick and caught it. The resistor for hi and low is in series to both as you say, not as I did.
__________________
The Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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#8
07-20-2006, 08:19 PM
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>>and deleted the post,>>
We don't need a correction then, so I did the same.. Thanks for the reply.
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