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Old 01-31-2011, 02:53 AM   #1 (permalink)
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Date registered: Oct 2010
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Coolant Renewal

Hi

After I drain the coolant from my ML320, can I refill the system by pouring the new coolant into the expansion reservior?

I haven't got a vacuum coolant filler tool and am hoping that being patient whilst filling the reservior will do the trick.

This is how it works on my other car.

Thanks
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Old 01-31-2011, 04:20 AM   #2 (permalink)
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Originally Posted by mor606 View Post
Hi

After I drain the coolant from my ML320, can I refill the system by pouring the new coolant into the expansion reservior?
Interesting question for me also, with a M112 engine. I checked my WIS for your model, and it states under 'Drain/Fill with coolant'.

Filling: Pour in coolant and bleed coolant system using the vacuum method - which it gives details of.

Vacuum filling was a modification to the WIS procedure in 10/04, so how the bleeding was achieved before then, I do not know.

If you have only drained your coolant at the radiator drain plug, I'm surprised that this bleeding is required. But if you have drained at the crankcase, the entire coolant will have gone, so this may be essential then to remove potential airlocks in the heater and a/c systems.
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Old 01-31-2011, 04:27 AM   #3 (permalink)
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The filling procedure is exactly the same as your other vehicle. Before you change the coolant, check to see that the Coolant Circulation Pump is working.

With the key in pos. #2 (engine not running) with your hand feel that the pump is running.
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Old 01-31-2011, 06:23 AM   #4 (permalink)
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The filling procedure is exactly the same as your other vehicle.
I respect your opinion... so what does the vacuum system achieve?
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Old 01-31-2011, 09:12 AM   #5 (permalink)
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Keyhole, I presume this system of bleeding was instituted so mechanics at the dealers wouldn't have to baby sit each and every vehicle that they filled. But with that said, it isn't feasible to own or get one of these bleeders .

When I said that it was the same as his other vehicle, I assumed he was referring to another vehicle he owned, in which he used the simple drain and pour method.
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Old 01-31-2011, 12:16 PM   #6 (permalink)
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Vacuum filler gets coolant in fast without air pockets. Filling ML is not an issue because expansion tank is high so system bleeds itself when filled slowly. On cars with rear engine front radiators vacuum filler is a must.

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Old 01-31-2011, 01:24 PM   #7 (permalink)
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FWIW I have always filled from the upper radiator hose and top up at the expansion tank after warming the engine.
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Old 01-31-2011, 05:20 PM   #8 (permalink)
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I have reverse flow cooling on track car engine and it has a special air bleeding cap I have
to remove when doing coolant and adding water wetter.
For the MLs I have never had a problem using the reservoir tank and pouring it in slowly.
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Old 02-01-2011, 03:41 AM   #9 (permalink)
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Thanks for all the replies.

I should have mentioned the procedure for my other car:

a) After draining from the bottom radiator hose, open the bleeder screw near the thermostat on the side of the engine.

b) Slowly fill the coolant reservior until bubble free coolant come out of the bleeder hole. This can take some time so be patient. Shut the bleeder screw.

c) Start the engine and idle at 1500rpm whilst topping up the system. Continue until the cooling fan cuts in.

Do you know if there is bleeder valve on the ML?

Last edited by mor606; 02-01-2011 at 03:44 AM.
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Old 02-01-2011, 04:05 AM   #10 (permalink)
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Do you know if there is bleeder valve on the ML?
If there is, there is no reference to it in the WIS.....
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