A coolant leak from the radiator can be caused by a defective thermostat bypass. This can cause pressure spikes in the cooling system, which leads to radiator failure. The thermostat assembly and radiator should be replaced.Google+
Car Problem Reports
Ford F-350 Super Duty Coolant Leak from Radiator
Ford F-350 Super Duty Problem
Engine Affected: 6.4L V8 Diesel Turbo
Average Mileage: 75,802 mi (36,200 mi - 113,825 mi)
Visitor, 2008 Ford F-350 Super Duty, 6.4L V8 Diesel Turbo, 94,000 mi
Radiator leaking coolant from driver's side. unable to keep fluids at cool level on reservoir.
Visitor, 2008 Ford F-350 Super Duty, 6.4L V8 Diesel Turbo, 67,000 mi
Radiator just started leaking at the bottom of the tank.
Visitor, 2008 Ford F-350 Super Duty, 6.4L V8 Diesel Turbo, 76,000 mi
Could not keep coolant in engine while pressurized, so I drove with the cap loose till I could get it to Ford. They replaced the Radiator and coolant. Then my EGR valve went. Not covered by my extended warranty, so they wanted $995.00 to replace, I purchased online for $167 motorcraft part. Put in myself. Stilll, would not run right. Now the Diesel Particulate Filter and sensor are bad. 82,000 miles. Chevrolet here I come, or Dodge. Ford Sucks.
Visitor, 2008 Ford F-350 Super Duty, 6.4L V8 Diesel Turbo, 75,000 mi
First leak at 75,000 Miles now again at 122,000 miles not covered under 200,000 mile warranty. Replaced first radiator at no cost to me minimal help with second radiator. Ford motor company aware of this problem but will not recall.
Visitor, 2010 Ford F-350 Super Duty, 6.4L V8 Diesel Turbo, 93,000 mi
Radiator had to be replaced at 93k miles due to failure in the top drivers side section of the radiator.
Visitor, 2008 Ford F-350 Super Duty, 6.4L V8 Diesel Turbo, 113,825 mi
replaced front cover to stop coolant from getting in crankcase at 92000 miles had already been in shop on numerous time. At less than 105000 miles differential went out not covered under warranty .At lest than 140000 miles replaced front cover hipressure fuel pump and radiator. lest than 5000 miles later had to replace complete engine turbo included Truck has been in and out of shop since about 20,000 miles
Visitor, 2008 Ford F-350 Super Duty, 6.4L V8 Diesel Turbo, 73,000 mi
the same as indicated above