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  #1  
Old 07-27-2005, 12:21 PM
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auxiliary fan's fuse keeping burning

I have a 91 300ce mercedes benz and the fuse for the auxiliary keep burning whenever i turn on the air conditioning. As i monitor engine, I saw that there is a coil next to the dryer keep getting really hot. Once that coil got so hot then the fuse is blown. Please give me some advice. Thanks a lot

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  #2  
Old 07-27-2005, 12:50 PM
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Fuse D or fuse 7 ???
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  #3  
Old 07-27-2005, 01:32 PM
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Check the fan motor!

As motors age and lubrication dries out, they draw more and more current.



Michael
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  #4  
Old 07-27-2005, 02:06 PM
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Quote:
Originally Posted by Arthur Dalton
Fuse D or fuse 7 ???
fuse D
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  #5  
Old 07-27-2005, 02:46 PM
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OK

That [ D] is low fan load circuit.
Couple of easy test
1 . turn each fan by hand to see that they are both free.
2 .Check connections on each side of resistor, they burn and make a bad connection
3 . Take a jumper wire with an amp meter wired in series and jump from Bat+ to the terminal with 2 wires on it at resistor. This is fan draw and should not excced 25 A.. if it does , you have a bad fan motor .. if fine , Benz has upped fuse D to 25 A on double fan models.
Lastly, there has been wire problems between the relay and resistor for low fan , so check any for burnt at the relay end too..
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  #6  
Old 07-27-2005, 03:02 PM
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Quote:
Originally Posted by Arthur Dalton
OK

That [ D] is low fan load circuit.
Couple of easy test
1 . turn each fan by hand to see that they are both free.
2 .Check connections on each side of resistor, they burn and make a bad connection
3 . Take a jumper wire with an amp meter wired in series and jump from Bat+ to the terminal with 2 wires on it at resistor. This is fan draw and should not excced 25 A.. if it does , you have a bad fan motor .. if fine , Benz has upped fuse D to 25 A on double fan models.
Lastly, there has been wire problems between the relay and resistor for low fan , so check any for burnt at the relay end too..



Can you please tell me where is the relay? Thanks
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  #7  
Old 07-27-2005, 03:10 PM
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Box behind fuse compartment .. have to take 6 screws out and lift the top

Easiest if hood is full tilt.
There are two [ high/low].. you want the one in slot 'B"

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