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Old 07-03-2008, 11:31 PM
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Join Date: Jan 2006
Posts: 121
Exclamation Bypassing Radiator during FLUSH???!!!

I'm putting in a new rad into a 87 300D, and want to flush the system before refilling it with MB fluid.

Would anyone NOT recommend bypassing the rad to do a flush, I don't want to flush with the new rad in place, as it will get contaminated, and I don't want to flush with the old rad in place, as it will take much longer with all the debris in the old rad and probably just carry those contaminets into the engine/head during the flush???

I will be keeping an eye on the Temp Guage the entire time so that it does not climb above 100C during the Flush W/O a rad.

I'm not going to use Cirtic Acid as I fear it will attack my already volnurable head gasket, instead a Regular Prestone flush is what I'll be using.

Let me know what you think...

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Old 07-03-2008, 11:48 PM
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The problem is that you will only be able to run it for a few minutes before approaches 100C, then you have to wait a couple of hours and do it again. It's going to take a while to get a significant flush completed.

I would probably just do the flush with the old radiator in place unless you suspect there are some big chunks in there.
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Old 07-03-2008, 11:55 PM
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Join Date: Nov 2007
Location: Cameron Park CA
Posts: 1,863
im sure after you do a rinse run a once or twice youll get all the corrosion chunks out of your head that came loose from the rad. Dont worry about it. your being too technical.
1981 300SD 512k OM603

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Old 07-04-2008, 12:09 AM
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Crazy mechanic.
Join Date: Jan 2007
Location: olympia washington
Posts: 1,809
take the t-stat out and shove the hose in the bottom radiator hose with the radiator out, there should be no issues. At idle even if your engine goes over 100C it still is unlikely it will cause any permanent damage.

Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.
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