Drain engine coolant with help of auxiliary coolant pump >how< M103 W124

[DREAMER NO2]

Any one done this,, it is possible . I do know that you can use the auxiliary coolant pump ,,by removimg the plug from the rear and then put a 12volt feed to it , to get auxiliary pump to work ..The engine will not be needed to do this operation ...just N + P wire from your battery to auxiliary coolant puimp . So the A/pump will suck out the old coolant but it must have an outlet for the old coolant to escape This is were i am stuck ---so what must be dissconected to let the old coolant escape ? I need the information so i can do this myself. I want to remove all of the old colant,, so i can refill 50/50 . My block tap is stuck and untill i get the manifolds off i cant fix it . Thanks for looking in .

 

[mioba]

you could remove the stat and a rad hose and do a backflush.

Fill with water run it, empty - a few times.

then add half vol of antifreze and top up rest with water.

 

[DREAMER NO2]

mioba .So will i have to put the cover back on without the thermostat in there .. But it can be done with the help of the auxiliary pump .

 

[Jim2]

I saw a video of a coolant change and flush where they removed the return pipe ( engine to expansion tank) started the engine and let pump out the old fluid, ( into a container by adding some plastic piping ) while replacing it in the tank, first with just water, and when it was running clean, adding 50 /50 anti freeze mix. Was not in an MB though. So not sure if it would work. But maybe some one here has done it, and can advise?

 

[DREAMER NO2]

Thanks Jim but there is a way to use the aux pump to clear coolant, that way you dont have to keep filling up the coolant tank . I saw it on a forum should have keept it ,, but i never thought i would ever need it .

 

[mioba]

mioba .So will i have to put the cover back on without the thermostat in there .. But it can be done with the help of the auxiliary pump .

Yes this will keep the entire circuit open.
An ideal time to replace the stat

 

[DREAMER NO2]

I have just filled up the coolent system after i have fitted a new Gates t/stat i removed the brass vent blanking plug on the sensor rail till water came out ,,and it took 6 ltr ... So we do have old coolant still in there .I will run it for a few mins so its circulates , and then drain it off from bottom hose .Refill and repeat a few times then when coolant is clear ,,refit the bottom hose and tip in the 5 ltr of a/f mix followed by water .Test the strength till its the right strength /

 

[DREAMER NO2]

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