Verifying cooling fan/fan assembly/radiator fan is dead? - Mercedes-Benz Forum
 
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post #1 of 9 (permalink) Old 07-14-2019, 05:35 PM Thread Starter
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Verifying cooling fan/fan assembly/radiator fan is dead?

MB calls it the "fan assembly" but for the ML55 it's the electric fan that sits below the upper radiator hose (preaching to the choir).

I tried jumping the relay but it won't kick on. I don't have any tester relays but I was able to jump the two relays next to K26 and think the fan is dead. I wanted to check and see if there's any other methods to try before I get a replacement. These things aren't cheap!
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post #2 of 9 (permalink) Old 07-14-2019, 09:05 PM
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Originally Posted by ed7c9 View Post
MB calls it the "fan assembly" but for the ML55 it's the electric fan that sits below the upper radiator hose (preaching to the choir).

I tried jumping the relay but it won't kick on. I don't have any tester relays but I was able to jump the two relays next to K26 and think the fan is dead. I wanted to check and see if there's any other methods to try before I get a replacement. These things aren't cheap!

ed,

Post #4 may be of some assistance.
- https://www.benzworld.org/forums/w16...oling-fan.html


edit

Im sure you are aware of this too? for ML55s and ML55s

one more attachment....
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post #3 of 9 (permalink) Old 07-15-2019, 09:35 AM Thread Starter
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great info, thank you. didnt think about that fuse, will check tonight.

ps that fix on the fan was pretty unique
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post #4 of 9 (permalink) Old 07-16-2019, 04:27 AM Thread Starter
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Well fuse was okay. Does anyone have a wiring diagram for that fan?
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post #5 of 9 (permalink) Old 07-16-2019, 05:38 AM
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Well fuse was okay. Does anyone have a wiring diagram for that fan?
What problems are you having? Engine over 110 C, a/c not cooling at idle?

Few relevant threads.

https://www.benzworld.org/forums/w16...ight=ML500+fan

https://www.benzworld.org/forums/w16...ight=ML500+fan
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post #6 of 9 (permalink) Old 07-16-2019, 05:40 AM
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Here is the diagram and legend.

With the key out of the ignition, check the RED wire for 12v+ and the BROWN wire for GROUND.

Then, with the eng. running, monitor the WHITE wire & follow instructions for as of 2001.
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File Type: pdf Remote Desktop Redirected Printer Doc. #3pdf.pdf (9.4 KB, 9 views)
File Type: pdf AC Fan (Suction) Tests.PDF (27.8 KB, 9 views)

Last edited by 43sqd; 07-16-2019 at 05:45 AM.
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post #7 of 9 (permalink) Old 07-22-2019, 07:30 AM Thread Starter
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Thanks gents. fan was toast. did all the test and failed. picked up a Chinese one on eBay for $240. working great so far. not ideal but OEM unit cost more than the E60 BMW I just picked up on facebook marketplace so I went with it. If I find a low mileage, OEM unit down the road I will pick it up. nice to have piece of mind at least and cold air at idle.
ps - dead fan did trigger the coolant level indicator up front. finally turned off when I installed the ebay one.

Last edited by ed7c9; 07-22-2019 at 07:36 AM. Reason: -.-
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post #8 of 9 (permalink) Old 07-25-2019, 07:28 PM
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Hi. I have a 2003 ML500 V8 and my radiator fan went out. According to my Mercedes mechanic, it could have just gone out or my muffler shop shorted it out while welding the catalytic converter. Either way, I'm stumped trying to find a replacement. I got one from parts geek for 700, and it LOOKS the same, but the final 2pin connection has a small blockage in the connector. I thought I would try and tear that bit out with a screwdriver. It connected after that, but then the fan and dash lights came on WITHOUT THE KEY IN IGNITION!! I immediately disconnected and took the unit out. Question: Is it obviously NOT the right part or do I need to do some type of connection sequence for My Mercedes (Silver Girl) to "recognize" the fan? Or do I just try and find one with the right matching connector? Everything "looks" exactly the same on the new fan, even the connector, except for that tiny molded plastic that would not let it connect. I'm so confused, but I love this old car! Any ideas?
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post #9 of 9 (permalink) Old 07-25-2019, 08:51 PM
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Originally Posted by dreamkacher View Post
Hi. I have a 2003 ML500 V8 and my radiator fan went out. According to my Mercedes mechanic, it could have just gone out or my muffler shop shorted it out while welding the catalytic converter. Either way, I'm stumped trying to find a replacement. I got one from parts geek for 700, and it LOOKS the same, but the final 2pin connection has a small blockage in the connector. I thought I would try and tear that bit out with a screwdriver. It connected after that, but then the fan and dash lights came on WITHOUT THE KEY IN IGNITION!! I immediately disconnected and took the unit out. Question: Is it obviously NOT the right part or do I need to do some type of connection sequence for My Mercedes (Silver Girl) to "recognize" the fan? Or do I just try and find one with the right matching connector? Everything "looks" exactly the same on the new fan, even the connector, except for that tiny molded plastic that would not let it connect. I'm so confused, but I love this old car! Any ideas?


No need to double post if someone doesn't get back to you right away.
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