To flush or not

[WichitaF250]

Flushed coolant 2 years ago put cat elc in with a new oil cooler and egr delete at 60k miles. Well now 85k I have a hight delta about 20-25 at speed, already bought new oil cooler and some restore, restore+. Coolant is real clean, should I just replace oil cooler and put new coolant in or do the flush and chance busting loose 2 years worth of settled crap that's in there?

 

[Mdub707]

Well if you flush you should flush BEFORE replacing the new oil cooler so it just gets caught in the old oil cooler. Do you have a coolant filter? I flushed mine at like 90k miles with chemicals and found basically nothing in it. I would at least do a distilled water flush. If it was my truck I'd probably do the chemical flush again, but that's just me.

 

[bboteler]

Agreed...try the flush before you tear it apart.

 

[WichitaF250]

Ok I do have a coolant filter but it's only been on a few hundred miles. I will flush and see if that helps before I tear in to it.
From reading on here people are saying to flush with old cooler in and if deltas aren't to bad drive it a while let all the crap settle in old cooler then change cooler?

 

[Mdub707]

Correct. Do your flush. Drive it a bit maybe with just distilled water in it to circulate and let the coolant filter and old oil cooler catch all the crap (maybe just drive it for 2 hours or something), drain, do your oil cooler, change the coolant filter and fill with new coolant.