My fan is alwasy screaming - Mercedes-Benz Forum
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post #1 of 15 (permalink) Old 05-20-2019, 02:20 PM Thread Starter
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My fan is alwasy screaming

The fan is new but right from the start, hot of cold it does not matter, the fan is screaming... so much so that even with the top down at highway speed I can hear the fan.

My temp gauge sits between 90c and 95C, but even when I first start the engine the fan is screaming as I pull away in 1st and the engine goes over 2000 rpm. Shouldn't the thermal clutch disengage the fan unless the temp goes too high and it needs to cool down? I can't imagine the fan needs to do much work at 60mph on the highway but I can still hear it screaming.

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post #2 of 15 (permalink) Old 05-21-2019, 12:40 AM
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Definitely the fan and not a belt?
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post #3 of 15 (permalink) Old 05-21-2019, 03:19 AM Thread Starter
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Definitely the fan and not a belt?
Definitely the fan... everything up front is new except the AC compressor and that's not engaged.

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post #4 of 15 (permalink) Old 05-21-2019, 05:43 AM
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After I installed a new clutch I took a look at the old one. The fins were completely filled with debris including the sensor strip. No wonder it couldn't clutch out. Take a look at yours, maybe a little work with wire brush will revivify it.
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post #5 of 15 (permalink) Old 05-21-2019, 08:45 AM
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Screaming or roaring? Try spinning cold. Should spin pretty easy but not freewheel.
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post #6 of 15 (permalink) Old 05-21-2019, 08:47 AM Thread Starter
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After I installed a new clutch I took a look at the old one. The fins were completely filled with debris including the sensor strip. No wonder it couldn't clutch out. Take a look at yours, maybe a little work with wire brush will revivify it.
It's brand spanking new... less than 2000 miles on it.

Besides... it screams at full speed as soon as I start the engine. Shouldn't the clutch engage as a function of heat?

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post #7 of 15 (permalink) Old 05-21-2019, 08:53 AM Thread Starter
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Screaming or roaring? Try spinning cold. Should spin pretty easy but not freewheel.
Roaring.

I'll spin it when I get home. I left it in the garage today... yesterday was 85 and sunny, when I left for work this morning it was in the 50's and windy. Go figure.

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post #8 of 15 (permalink) Old 05-21-2019, 03:03 PM Thread Starter
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I can move the fan blades but they don't spin free. When flipping the fan as hard as I can it comes to a dead stop as soon as I let go. There is no free spinning at all.

Is that good or bad... or is it a meaningless test?

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post #9 of 15 (permalink) Old 05-21-2019, 06:27 PM
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I think it is bad. I tried my 560 and it advances 3 to five blades after I let go. I remember a test involving running engine and rolled up newspaper. I never had the guts to try it.
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post #10 of 15 (permalink) Old 05-21-2019, 06:55 PM Thread Starter
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Mine definitely does not advance at all once I let go. I think I'll put the old fan clutch back on and see if it makes a difference.

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