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Message: [QUOTE="Six_Sloww, post: 1397863, member: 13248"] Oil is cooled by the primary cooling system. If I understand correctly half of the secondary radiator is thermostatically controlled for the trans cooler and egr cooler, where the other half is for the cac and fuel cooler. Which would make sense, they wouldn't want to be on the same circuit as the 200+ degree transmission fluid and hot egr. After the coolant leaves the hot cac and hot trans fluid cooler, they all converge back in the secondary degas bottle so it's not surprising these things are puking. If you think about the secondary heat exchanger in halves, that means there isn't that much cooling surface dedicated to keeping the iat's at ambient. Especially when the truck is moving twice the air or making twice the boost the system was designed to see. [/QUOTE]

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