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Head gaskets probably. Tee- in a gauge and monitor cooling system pressure, an ECT and EOT. Check if the ECT/EOT is within 15 degrees. If not, repair that first. If it is, and you are getting 16psi pressure in the cooling system, it is likely a head gasket leak.
Check all other coolig system components for leakage, restriction, and proper operation first.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.