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#1
11-05-2003, 01:37 PM
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Idea for cooling system flush - W210
So I have been wanting to flush and fill my cooling system but have been putting it off because of my perceived "hassle factor" of accessing and draining both the radiator and engine block drains. I'm a big guy and the idea of reaching into cramped areas does not appeal to me.
As I was looking under the hood, I noticed the pump for the residual heat system is easily accessible. My possible ideas for alternative ways to flush the system would be 1.) can the coolant lines at the residual heat pump be disconnected and used a block drain alternate? or 2.) can a jumper wire be attached to the residual heat pump and the pump be used to pump out the old coolant? I am being crazy, lazy or what? Give me your opinions. -Gabby 
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#2
11-05-2003, 07:29 PM
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"am being crazy, lazy or what?"
Maybe all the above but I like the way you think.  I just looked the schematics over and it appears you might be on to something if the thermostat is removed when you try it. Please let us know, you might just save us all a lot of time when we're ready for fluid flushes too!!
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#3
11-05-2003, 09:48 PM
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Sounds like a great idea. If you turn the heater on, wouldn't the pump run?
Just don't put tap water in the system. It's the kiss of death 
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#4
11-05-2003, 10:14 PM
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I just looked at my service manual CD and it says that you can turn the recirculation pump on with the key in the on position (engine not running) and the defrost switch in. Sounds interesting. Let me know if this works!!
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#5
11-06-2003, 09:34 AM
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I drained the cooling system and radiator on my 1999 E430 last year. The block drain is on the right side of the block, above the motor mount. However, after I had drained the radiator I found nothing at the block drain. Apparently M-B designed the system so that everything drains to the radiator. So, I don't think you need to bother with the aux pump; it probably won't have anything to pump except for a bit in the heater core. It may not even do that since the pump isn't designed to lift, just circulate. And, there is the mono valve to deal with.
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#6
11-06-2003, 01:36 PM
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Jet,
You are right about turning on the pump with the ignition on. I tried it last night and could tell the pump was running. Living in Hawaii, I've never had a reason to use the heat pump before. Thanks.
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