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General E46 Forum
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Old 04-27-2010, 03:44 PM   #1
jcs325iT
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Coolant flush--with a flush machine...Anyone had it done..?

Has anyone ever had their coolant replaced via a flush machine, ala BG or Wynn's...??

The machine/pump basicially pushes the old coolant out, removes any contaminants that may exist (or old non-compatible coolant) and your new coolant is pumped in.....basically in a couple of steps.

I was wondering if there are any techs who have used this on a BMW in their line of work or if any E46 owners have had it done.....Thanks in advance.
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Old 04-28-2010, 05:52 AM   #2
jcs325iT
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Bump....Nobody...?? Bueller...??

Well, I have access to having a flush performed this way, rather than opening up the drain plugs on the block and everywhere else....so I am thinking about it.

There are cleaning agents that can also be used in the process, but rather than doing this I am going to buy some extra distilled water to flush the system out with before putting the new BMW coolant/distilled water mix in the engine.

The beauty part is that it should only take about 1/2 hour-45 minutes to do it all.
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Old 04-28-2010, 06:10 AM   #3
dmax
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A few thoughts:

You can buy 2 extra galls. of distilled, just drain from ET/Rad from plugs...add water, drive around block a couple times...let cool a tad...drain...refill with water...keep going until it's clean. I did this when switching from unknown coolant to oem fluid.

Use block drain last time, but keep track of amount drained so you can adjust to 50/50 accurately...since I don't think all the coolant will, in fact, drain...most though.

If the flushing machine uses pressure above what the WP would generate, then the only things I'd be concerned about is it pushing whatever residue might be built up in system into places you don't want. If this is a flush at slow speed (as it were), then I don't see much issue.

Some flush in reverse to unclog the heater core...but it's disconnected, I presume, at that time.

GL!

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Old 04-28-2010, 08:30 AM   #4
jcs325iT
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Quote:
Originally Posted by dmax View Post
A few thoughts:

You can buy 2 extra galls. of distilled, just drain from ET/Rad from plugs...add water, drive around block a couple times...let cool a tad...drain...refill with water...keep going until it's clean. I did this when switching from unknown coolant to oem fluid.

Use block drain last time, but keep track of amount drained so you can adjust to 50/50 accurately...since I don't think all the coolant will, in fact, drain...most though.

If the flushing machine uses pressure above what the WP would generate, then the only things I'd be concerned about is it pushing whatever residue might be built up in system into places you don't want. If this is a flush at slow speed (as it were), then I don't see much issue.

Some flush in reverse to unclog the heater core...but it's disconnected, I presume, at that time.

GL!

Doug
Thanks Doug for the reply.

There is not much pressure generated at all with the machinery as I understand it, and the coolant in my car now looks pretty good.......I am not a fan of running caustic fluids through my cooling system, so that is why I tend to use only distilled water while in the 'flush' phase, which is done at normal operating temperature but not while the engine is running....after that happens, then the new BMW coolant goes in at a 50/50 premix.
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Old 04-28-2010, 08:50 AM   #5
NoVaDreier
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Curry's in Chantilly has done mine several times with the BG service.
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Old 04-28-2010, 09:04 AM   #6
jcs325iT
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Curry's in Chantilly has done mine several times with the BG service.
This is a BG machine we'll be using as well......

Have you had good luck with the process, especially since you've had it done before.....???
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Old 04-30-2010, 05:53 AM   #7
NoVaDreier
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I've had no problems at all with the BG cooling system backflush. You'll also need the BG Flush Kit K6830 for your car.
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