W211 2005 E500
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W211 2005 E500
Hello I need help, I have changed water pump,radiator,coolant reservoir and done a test to check if it was the head gasket but it wasn’t. It is still overheating what else could be the problem please!?
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From: New England
2004 E 500 4MATIC Wagon; 2015 ML 350 4MATIC; †2003 C 240 4MATIC Wagon (2003-2022)
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Are you losing coolant and the oil is turning to a milkshake? Then you might want to look into this. If you go to Mercedes-Benz master tech Tasos Moschatos' YouTube channel, he discusses inspecting those seals on M112/M113/M113K engines whenever those symptoms arise and the water pump is out in a number of his video inspections. On this forum, I happened to mention replacing/refreshing those seals (and other components) in those engines a day earlier.
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What about that little black secondary electric water pump that is right behind the passenger side headlight area?
If that is bad and not spinning, it will restrict the flow of coolant circulation.
https://www.fcpeuro.com/products/mer...264-2118350265
If that is bad and not spinning, it will restrict the flow of coolant circulation.
https://www.fcpeuro.com/products/mer...264-2118350265
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Newbie
Joined: Nov 2024
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What about that little black secondary electric water pump that is right behind the passenger side headlight area?
If that is bad and not spinning, it will restrict the flow of coolant circulation.
https://www.fcpeuro.com/products/mer...264-2118350265
If that is bad and not spinning, it will restrict the flow of coolant circulation.
https://www.fcpeuro.com/products/mer...264-2118350265
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From: New England
2004 E 500 4MATIC Wagon; 2015 ML 350 4MATIC; †2003 C 240 4MATIC Wagon (2003-2022)
Not necessarily. While it certainly could be due to a blown head gasket (relatively rare on these engines), the more common case with these M113 engines is that the seals around the coolant passages through the front timing cover behind the water pump have degraded over time and are failing (or have broken apart and/or been forced out of place). Was the car already experiencing overheating prior to replacing the water pump, and, if so, did you/your mechanic inspect the condition of those seals when the old water pump was removed? That should be a standard practice when replacing water pumps on these old engines... I only mention all of this, since it seems that you/your mechanic had investigated the possibility of a head gasket failure.
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Not necessarily. While it certainly could be due to a blown head gasket (relatively rare on these engines), the more common case with these M113 engines is that the seals around the coolant passages through the front timing cover behind the water pump have degraded over time and are failing (or have broken apart and/or been forced out of place). Was the car already experiencing overheating prior to replacing the water pump, and, if so, did you/your mechanic inspect the condition of those seals when the old water pump was removed? That should be a standard practice when replacing water pumps on these old engines... I only mention all of this, since it seems that you/your mechanic had investigated the possibility of a head gasket failure.
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2004 Mercedes Benz E500
I had a similar problem 2 years ago. The cause was the motor fan. It was not working regularly. I was skeptical when I was told about it by the mechanic because I had seen the fan working several time. After replacing the fan , all went back to normal.
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Not necessarily. While it certainly could be due to a blown head gasket (relatively rare on these engines), the more common case with these M113 engines is that the seals around the coolant passages through the front timing cover behind the water pump have degraded over time and are failing (or have broken apart and/or been forced out of place). Was the car already experiencing overheating prior to replacing the water pump, and, if so, did you/your mechanic inspect the condition of those seals when the old water pump was removed? That should be a standard practice when replacing water pumps on these old engines... I only mention all of this, since it seems that you/your mechanic had investigated the possibility of a head gasket failure.
hello yes mechanic replaced seals when changing water pump!
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Thread Starter
Newbie
Joined: Nov 2024
Posts: 10
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What about that little black secondary electric water pump that is right behind the passenger side headlight area?
If that is bad and not spinning, it will restrict the flow of coolant circulation.
https://www.fcpeuro.com/products/mer...264-2118350265
If that is bad and not spinning, it will restrict the flow of coolant circulation.
https://www.fcpeuro.com/products/mer...264-2118350265
Hello yes it is still working!!
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From: New England
2004 E 500 4MATIC Wagon; 2015 ML 350 4MATIC; †2003 C 240 4MATIC Wagon (2003-2022)
Just to be clear, I am not referring to the water pump gasket seal that is removed in this video at the 4:11 time mark (see: https://youtu.be/9qUPWbstYfI?si=gxBpXlFGUOHKAf0u&t=251) . Rather, I am referring to the two O-ring seals around the coolant passages between the front timing cover and engine block discussed in the post/thread at the URL link in my previous reply, which are shown at the 4:30 and 4:40 time marks of the video. In order to replace them, the front timing cover must be removed, which, as the post linked to in my previous reply indicates, is a fairly big/expensive job in terms of labor... At any rate, those seals should always be inspected on these older engines when the water pump is out, but many mechanics are too lazy to do this or lack knowledge about the M112/M113/M113k engines... As I stated earlier, this is what one would also investigate if there is evidence of mixing of coolant and engine oil (similar to a blown head gasket's symptom).
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Just to be clear, I am not referring to the water pump gasket seal that is removed in this video at the 4:11 time mark (see: https://youtu.be/9qUPWbstYfI?si=gxBpXlFGUOHKAf0u&t=251) . Rather, I am referring to the two O-ring seals around the coolant passages between the front timing cover and engine block discussed in the post/thread at the URL link in my previous reply, which are shown at the 4:30 and 4:40 time marks of the video. In order to replace them, the front timing cover must be removed, which, as the post linked to in my previous reply indicates, is a fairly big/expensive job in terms of labor... At any rate, those seals should always be inspected on these older engines when the water pump is out, but many mechanics are too lazy to do this or lack knowledge about the M112/M113/M113k engines... As I stated earlier, this is what one would also investigate if there is evidence of mixing of coolant and engine oil (similar to a blown head gasket's symptom).
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From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
You haven't described when it overheats and what conditions. Is it straight away, only sometimes, heavy traffic, highway? And what's occurring so you know it's overheating? Gauge only, excess pressure?
Youv'e changed every part but have you scanned for codes? You might see something there that points you to an electrical issue - fans, coolant temp sensor, Aux pump, relays etc. You've loaded the parts canon, now load the information one so people can help you.
Youv'e changed every part but have you scanned for codes? You might see something there that points you to an electrical issue - fans, coolant temp sensor, Aux pump, relays etc. You've loaded the parts canon, now load the information one so people can help you.
Last edited by BlackML550; Nov 26, 2024 at 07:21 PM.
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You haven't described when it overheats and what conditions. Is it straight away, only sometimes, heavy traffic, highway? And what's occurring so you know it's overheating? Gauge only, excess pressure?
Youv'e changed every part but have you scanned for codes? You might see something there that points you to an electrical issue - fans, coolant temp sensor, Aux pump, relays etc. You've loaded the parts canon, now load the information one.
Youv'e changed every part but have you scanned for codes? You might see something there that points you to an electrical issue - fans, coolant temp sensor, Aux pump, relays etc. You've loaded the parts canon, now load the information one.
it doesn’t overheat straight away but it does overheat in traffic/heavy traffic! when the temp goes above 80 hitting 90 to 120 the coolant water comes out of the reservoir tank but if not in traffic and I keep the car going with the heater high the temp stays at 80 or drops below that!
yes it was scanned I’ve put it down below but I did ask him to send me a clear one which he ignored me and i couldn’t contact him cause he changed my key fob but it ended up being faulty and I tried to contact him about it but he wouldn’t get back to me!
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From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
You haven't been clear about whether your fans are coming on. I'd suggest that's where you should look. That's why i said look at the scans. You may have a faulty temperature sensor or an electrical problem. Have you checked all the fuses and the wiring to the fan that can corrode? The fans have encountered problems with age. Remove it and bench test it to see if it works and if it does, work your way back from there.
There are quite a few posts on this topic here and also look at W164, X164 and R251 forums as the engine bays are essentially the same.
There are quite a few posts on this topic here and also look at W164, X164 and R251 forums as the engine bays are essentially the same.
Last edited by BlackML550; Nov 28, 2024 at 03:17 AM.
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From: Melbourne, Australia
2010 ML550 VIN WDC1641722A564750, 2010 B180
