ac fan blower won't work on benz 300E - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 06-29-2006, 12:25 AM Thread Starter
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Question ac fan blower won't work on benz 300E

i own a 93 benz type 300E. the ac blower near the radiator won't work thus causing the machine temp to overheat, sometimes to dangerous level. if i turn off the ac, the temp might go donw abit but not to the level i would call normal. went to have it checked and the mechanic said it might be the aux fan resistor, is this true? if so, where is this resistor located?? i may want to DIY. thanxs in advance.
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post #2 of 8 (permalink) Old 06-29-2006, 01:41 AM
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also might be a fuse
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post #3 of 8 (permalink) Old 06-29-2006, 04:32 AM Thread Starter
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which fuse are we talking about here?? fusebox?
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post #4 of 8 (permalink) Old 06-29-2006, 09:51 PM
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Adianb,
You know, last summer my car seemed to be running very much hotter than it is now, the only difference is that I've had the freon levels charged up. When I asked my mechanic about that he seemed to think that the second fan might not kick in as much if the freon levels were lower for some reason (actually I think it's the compressor that wouldn't kick in and hence the 2nd fan wouldn't run?) but now my car, all summer long, has never ran hot and that's the only thing that's been done, other than keeping MB coolant added to it as it needs it on rare occasions.

Best of luck in solving your problem.
Regards,
Walter Cox
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post #5 of 8 (permalink) Old 07-04-2006, 12:32 AM
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for the aux fans to turn on you a/c has to reach a specific pressure.
there are two relays in the front fuse box - one for low speed and one for high speed.
check the fuses in the relays, I think the green one get a fuse w/5 more amps.
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post #6 of 8 (permalink) Old 07-05-2006, 11:50 AM
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I had the same problem with my 300E, it ended up being the connection for the fan was corroded. A little cleanup and then some dieelectric grease in connector and back to great.
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post #7 of 8 (permalink) Old 08-19-2006, 09:11 AM
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My problem was the fusible link which is located on the 91 300e in engine comp.
driver side after the fuse box in a liitle black box.
flip the cover open and check it, mine was a hairline crack you could hardly see.
If you have a meter check it out.
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post #8 of 8 (permalink) Old 09-05-2006, 05:14 PM
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Quote:
Originally Posted by adlianb
i own a 93 benz type 300E. the ac blower near the radiator won't work thus causing the machine temp to overheat, sometimes to dangerous level. if i turn off the ac, the temp might go donw abit but not to the level i would call normal. went to have it checked and the mechanic said it might be the aux fan resistor, is this true? if so, where is this resistor located?? i may want to DIY. thanxs in advance.

My AC fan (95 E300D) would not stay on after awhile. I checked the fuses and they were OK. Under the cover of the fuse box it says check fuse outside box and there is a 30 A fuse under a little black component and that was the culprit. It is a funny looking flat fuse. Anyway mine works fine now.
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