W211 E270 CDI - overheating?? - Page 2 - Mercedes-Benz Forum
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post #11 of 32 (permalink) Old 08-12-2017, 12:16 AM
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OK So you have not mixed different coolants so I doubt that your radiator is blocked. Don't use additives.
Did you have the heater set to high temp when bleeding and driving the car to allow complete circulation?
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post #12 of 32 (permalink) Old 08-12-2017, 02:09 AM Thread Starter
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Yes, I did turn the heating on and drove 10 minutes with heater on.

I also doubt that it would be radiator, I am reluctant to spend $300 on radiator without knowing that it is cause of the issue.
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post #13 of 32 (permalink) Old 08-14-2017, 07:34 AM
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Sounds like the radiator fins might be dirty and blocked up. Running at 100 deg C is not right, normal temp should be 85 to 90. Maybe your thermostat is not opening fully.

Good idea to remove the radiator and the clean all the bugs and stuff that collects between the condensor radiator and the engine radiator.
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post #14 of 32 (permalink) Old 08-15-2017, 10:16 PM Thread Starter
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Thanks. I will try cleaning the radiator.
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post #15 of 32 (permalink) Old 08-20-2017, 10:39 PM Thread Starter
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I decided to check the coolant temperature via Climate control diagnostics (by pressing Recirc - Off button on climate control panel). Code No. 8 value which was coolant/Engine temperature went upto 92C and Aux fan kicked in at that temperature.
The temperature went upto 100C on climate control screen which was consistent with the temperature guage on instrument cluster panel.

This morning while I try to run the diagnostics again the same value was reading as 40C whereas the Temperature guage in Instrument cluster was 100C.

Which sensor should I be looking to replace? Coolant or Engine Temperature Guage?
Secondly, Could it be the cause of car's overheating problem that I was having earlier? My understanding is that if sensor is reading 100C as 40C then thermostat valve is not opening up allowing the coolant to circulate?
Any help would be much appreciated.

Thanks in advance.
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post #16 of 32 (permalink) Old 09-07-2017, 08:32 PM Thread Starter
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Update : I ordered a new radiator and it has arrived (Behr). I will update the forum after installing the new radiator whether overheating issue has been resolved or not.
I was told that efficiency of the radiator deteriorate over time, and it made sense since its a 12 year old car now.
Is it true that if a car overheats on high RPM then a good place to start is radiator (provided there's no leakage) and if it is overheating on normal driving then it is most likely water pump?

Thanks for all your help and suggestions.
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post #17 of 32 (permalink) Old 09-07-2017, 09:19 PM
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Radiators can last longer than 12 years easily if not damaged or contaminated.
My cars are now 13 and 14 years old and are fine.
High speed rpm generates more heat,so you need a system that works 100%.
Lower speed could be ok on a system that works 70%.
I don't know,it depends on how bad the water pump is,if it pumps half the coolant it should then it could be ok at low speed but not at high speed.
A water pump can appear to be fine,but the only way to be sure is to remove it and inspect it for corrosion of the impeller fins.
A new radiator might solve your problem,or it might not.
Like Rory says it could also be the thermostat not opening properly. Most would try that first.

Last edited by Benzyle; 09-07-2017 at 09:22 PM.
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post #18 of 32 (permalink) Old 09-07-2017, 11:24 PM Thread Starter
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Thanks Benzyle for your thoughts.
I agree with you that radiators if maintained properly should last longer than 12 years, since I have only owned this car for a couple of years so I cannot guarantee about contamination. My mechanic also pointed out in changing the radiator so fingers crossed on new radiator. Based on your advice I'll have the water pump checked when installing the radiator.
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post #19 of 32 (permalink) Old 09-07-2017, 11:29 PM
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Originally Posted by Azeemmuh View Post
Thanks Benzyle for your thoughts.
I agree with you that radiators if maintained properly should last longer than 12 years, since I have only owned this car for a couple of years so I cannot guarantee about contamination. My mechanic also pointed out in changing the radiator so fingers crossed on new radiator. Based on your advice I'll have the water pump checked when installing the radiator.
Why not start with the cheapest and easiest thing first,,,,that is the thermostat.
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post #20 of 32 (permalink) Old 09-08-2017, 08:31 AM
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I did not see anywhere you mentioned the mileage of your vehicle. If you are near 150k and while the radiator is out, I would change the water pump as access to it would be easy.
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