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Took a before and after shot of a 6.7 Powerstroke oil cooler swap
I did a coolant filter and oil cooler job on a 2015 Ford F-250 last Tuesday in Austin. Before the swap it was running 230 degrees on the EOT vs 195 on the coolant on a hot day. After the new cooler and a flush the temps dropped to within 10 degrees of each other. Anybody else seen that big a difference on these trucks or was mine just especially clogged?
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the_holly12d agoMost Upvoted
Drove a buddies 2011 6.7 that was hitting 230+ on the EOT before he sold it to me so I know exactly what you mean about the massive temp difference. Yours was probably extra clogged but I think most of these coolers are borderline plugged by 100k miles if you don't flush the system every 30k. The coolant filter really helps keep the casting sand and debris out of the cooler in the long run. Glad to hear your temps came down that much, that's a solid payoff for the labor.
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simon_carr12d ago
Honestly, @the_holly brought up the coolant filter point which is spot on, but I'll add something else nobody's touched on yet. The real sneaky issue is the EGR cooler bypass valve sticking open or closed during these high temp events. When the oil cooler gets that clogged and the EOT spikes, the extra heat can warp or carbon lock the EGR cooler valve stem, which then causes recirculation issues that make the oil cooler work even harder after the swap. So even with a fresh oil cooler, if that valve is hanging up you'll still see temp separation problems within a few thousand miles. I'd pull the EGR valve and inspect it for any scoring or buildup before putting the truck back together. Saved my buddy from doing this job twice on his 2012.
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