Radiator Flush - Mercedes-Benz Forum
 
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post #1 of 9 (permalink) Old 04-29-2019, 03:49 PM Thread Starter
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Radiator Flush

Can anybody share how to do a radiator flush/clean?
Is the radiator filled only through that round reservoir tank on the passenger side near the wiper?
It's strange because on other cars there is a cap on top of the radiator itself where you fill in the fluid and there is also an accessory tank (reservoir?) that has its own cap.
However, in the B200, I can only see the round reservoir tank. Can anyone help?
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post #2 of 9 (permalink) Old 04-30-2019, 03:47 AM
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Is your coolant contaminated? How many kms do you have?


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post #3 of 9 (permalink) Old 05-01-2019, 10:24 AM Thread Starter
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Originally Posted by Road_Ghost View Post
Is your coolant contaminated? How many kms do you have?
150kms
My temp gauge goes to midline, sometimes past midline when I drive hard and when the airconditioning is not turned on. Otherwise, it is usually at 60' or below. I think reservoir level is going down a bit as well.
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post #4 of 9 (permalink) Old 05-01-2019, 01:29 PM
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It could be thermostat. I have had same problem. I have changed thermostat and coolant too. MBdavid could send you wis. It is somewhere on forum already posted. Try to search for it. Edit: Here is link https://www.benzworld.org/forums/#/t...3018142?page=1
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post #5 of 9 (permalink) Old 05-01-2019, 06:10 PM Thread Starter
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It could be thermostat. I have had same problem. I have changed thermostat and coolant too. MBdavid could send you wis. It is somewhere on forum already posted. Try to search for it. Edit: Here is link https://www.benzworld.org/forums/#/t...3018142?page=1
thanks
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post #6 of 9 (permalink) Old 05-02-2019, 05:38 AM
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Agree on the thermostat. The engine should warm up within about 10 minutes of driving. Should hover between 80 and 90 Celsius, a little higher in stop and go traffic in the summer or depending on your climate.

Yes, the system is filled via the reservoir. The reservoir is pressurized when the coolant warms up.

You already know about the drain from the other thread. Drain. If you want to flush the system, put the drain back on, fill it up with water (mixed with a flushing solution if you like - that is safe for aluminum and plastic), run for 15 minutes (or according to flushing solution instructions), then drain again, then fill with a 50/50 mix of the M-B approved coolant and DISTILLED water. I mix the coolant and water by pouring a bottle of each into a pail, then back into the bottles. That way the mix is perfect, even when you don't know how much the system will take.

There are always air pockets, so after filling the system, warm up the engine with the coolant reservoir cap off, and keep refilling. The reservoir should end up half full (at the top of the black portion). Put reservoir cap back on, then drive as usual. You may get the low coolant light for two to three days, even when you think all the air is gone. Just pull over and refill (have your mixes solution handy).

Obviously, if doing the thermostat, do it first since you loose coolant anyway. It's below and to the back of the air filter box, so you have to remove that. There are threads around here.
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post #7 of 9 (permalink) Old 05-02-2019, 11:23 AM
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When changing thermostat drain a whole coolant liquid. Don’t be afraid of low coolant light, like pfsantos said.
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post #8 of 9 (permalink) Old 05-03-2019, 07:23 PM Thread Starter
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Thanks alot pfsantos. I subscribed to your youtube channel.
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post #9 of 9 (permalink) Old 05-03-2019, 07:27 PM Thread Starter
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When changing thermostat drain a whole coolant liquid. Donít be afraid of low coolant light, like pfsantos said.
No I'm not afraid of the low coolant light to light up because I have had the check engine light lit for quite some time now. ELM/Torque says it's a fault code regarding the Temperature thingyfrown
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