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Replace Oil Cooler, flush water system before or after?


Maka22
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So there is thick black oil in my water system on my transit 07 MWB van
Got a new oil Cooler to replace mine, as it's a high possibility this why there's oil in the water.

But will be needing to flush out all the water system, pipes, rad a lot to clean out the oil.

Should I do with with the old oil cooler on? 
Or fit the new oil cooler then do all the flushing?

 Thanks   

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with the old cooler still conne4cted you will still be pumping oil in system. so replace the oil cooler and flush the system, best way to flush is with plenty of liquid clothes detergent and hot water, fill system and run engine for 10 mins, drain from bottom hose and redo, will take lots of flushing, and still you will residue for months after collecting in expansion bottle

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