Replacing the electric aux fan - fuse kept blowing W126 W124 SD 480p
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- Опубліковано 30 вер 2024
- Fuse number 1 kept blowing and lo and behold it was the aux fan itself. This video shows how to remove and re-install the single fan used on earlier W126 models. The later models used two instead of one, but it is the same principle.
This video also show the inside of the blower motor.
i just replace the bearings and everything worked fine on my w126 85 3-00sd
nice
Why didn't you just replace the bearings, now that you had it all taken apart?
That is a cheap part. A completely sealed bearing - and it would be as good as new
Yeah, I could have. Fan and shroud were corroded badly. The other thing I have bumped into is getting the sealed bearings is not as easy as one would think. Oh, of course you can get really cheap ones - problem is that there is a reason why they are so cheap. Tolerances are inconsistent and I have found the service life to be questionable at best. OEM type bearings are expensive.
@@straybenzes I imagine it is a standard part. An SKF Ball Bearing is good and inexpensive. Such parts do not have to be OEM, and most likely they are sourced from companies like SKF or similar. I doubt Mercedes makes their own bearings
@@viggosimonsen You are correct. SKF and FAG used to be the OEM bearing mfg for MB. You are ok if you can get real SKF or FAG bearings. Most of the stuff you get online are unfortunately knock offs and those are not worth installing.
My aux fan works fine when I turn on the AC (had a problem with the 0.2 resistor but I just skipped it so the fan works full speed when on AC).
But it never seems to work for the engine! I leave in Crete Greece (40°+ at summer) and the car overheats at idle but not when I have the AC on. That leads me to believe that it's the fan. It never comes on if I don't turn the AC on, no matter low hot the engine gets. I've changed the coolant sensor (blue)... Any idea?
Thank you very very much for the help!!!
The engine coolant high temp switch only kicks the fan on after the temp reaches above 105C Is the engine getting that hot?
@@straybenzes Yes, yes it did, in several occasions, I later found out that it was probably because I was running lean (had to adjust the EHA and change the O2 sensor due to lack of power and that also solved my overheating issues), now it only goes above 100° for a brief moment only the first time it heats up, and then drops and stays between the limits. That said, in every occasion where the car got hotter that 105° for several reasons each time, the aux fan never came on! I also did a "hack" with an 1.8k resistor at the coolant temp sensor, that's supposed to get the fun started at 95°, again didn't work.... 🤔.
(W124 200E 89')
Thank you so much for replying!!!
And thank you for you videos!!!
@@emmanuelkarantemoires2161 Glad you found out about some of your issues. Can you check if you can make the temp sensor trip ober and open flame?
@@straybenzes Not sure what you mean. You mean to trick the car thinking that it's getting hot and see if the fan starts? Like unscrew the sensor and put it at direct fire for example, good idea! Forgot to say that if I unplug the coolant temperature sensor (blue one) the fan kicks on immediately at high speed...
@@emmanuelkarantemoires2161 That temp switch closes as it gets hot. Strange that the fan comes on once you remove a wire. Other than that jumpering the switch is a good way how to confirm which and where a device is not working properly. Good luck!
Thanks love you😊😊
Thx!
Hello our great mechanic teacher,I want to replace the coolant temperature sensor but don't know the location. Can you please send me a link? Thanks and we really appreciate.
Certainly. For the OM613 Diesel it sits on top of the front of the engine near the intake manifold. Here is the link in the video where it shows what it looks like. ua-cam.com/video/Etj17D_O_Ps/v-deo.html
For the V8s the temp sensor sits on the thermostat housing where the upper cooling hose connects. ua-cam.com/video/fCSaUESNiRs/v-deo.html
It's a 1989 Mercedes Benz 300se
@@mkmk4314 Try this pic as it shows all three temp sensors/ switches and they are marked. www.benzworld.org/attachments/marked-b11_2-cise_ezl-and-b13-gauge_-cool-temp-sensor-jpg.421180/
Very Helpful Ralf! I had a replacement fan in my car (previous owner installed) and this aftermarket fan the polarity was switched in the plug so fan ran counter clockwise providing very little cooling. You may want to check your fan direction just in case!
Your buddy Peter from Kansas
Good point. Thanks for the tip. All the best.
Hi, I have an 87 560sec. My auxiliar fan is not working can this cause the engine stop when is on working temperature?
The short answer is no. That must have another root cause.
Hello Ralph I am getting ready to replace my struts. Shocks and rear bushings. Do you have a video that covers rear suspension bushings. For w124.
Thank you. Robert
Replacing shocks is not bad. Replacing the bushings is labor intensive. Unfortunately I do not have a video yet about that.
my w124 fuses number 12 melting when select no 3& 4 blower speed.Why?
That must be a non US spec car with manual climate control. Fuse 12 is the one for the blower motor. The most likely culprit is a defective / worn blower motor and / or blower motor resistor. A less probable cause is a short in a blower power wire. Good luck!
Hello,my fan used to blow faster and lowd and then it stopped ,now I received little or no air conditioning at all. Do you think I should install a new fan? Thanks
Hmm. A non working fan usually does not cause for you to have no AC. It will just not be as cold. Make sure that your system is fully charged. If you do not have a AC pressure gauge set you can still verify that your system is generally working. This video at minute 5:25 shows the wires to jump with the AC on MAX. ua-cam.com/video/Wd2jVB7ILFw/v-deo.html Good luck.
Hey Ralf, thanks so much for the video. Would the car overheat mostly in idle if the Aux fan is not working ?
Believe it or not, this is a loaded question. I'll give you an engineer's answer: It depends. So if you have very high ambient temperatures the engine temp may go higher than normal without that fan working. This fan is actually more so needed for the AC condensing cooler than helping cool the engine. Most elevated engine coolant temp issues are related to defective disco fan, gunked up thermostat or engine coolant passages, and / or water pump. There is also a possibility for the coolant gauge or its sensor to give false readings. I am hoping this helps you. Good luck.
@@straybenzes ralf you are an absolute legend. Having the clutch replaced today, hopefully thatll sort it out
@@supersuperentertain Good luck and thanks!
OK thank you ⚘❤❤❤❤
Glad you liked it.
Thanks keep up the awesome work.. glad you back
Thx. Yeah, it is a bit cold here so there tends to be a "winter break". More to come for certain.
@@straybenzes here in South Africa its flippen hot like 38 degrees Celsius.
@@dwaynecoomber6610 Yikes. No thanks! That is melting weather for big people.
👍
Thanks!