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James, Ford Technician
Category: Ford
Satisfied Customers: 3628
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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I have a 2003 F-350 with 6.0 diesel. I have had all the

Customer Question

I have a 2003 F-350 with 6.0 diesel. I have had all the upgrades heads, new ford head gaskets, apr studs, egr delete. I am currently on a long trip pulling a 10,000 pound trailer. I have noticed steam and water coming out of the coolant cap. The truck seems to overheat every 400-500 miles after losing coolant. New thermostat was installed and a new coolant reservoir cap. Any ideas what else could be causing this?
Submitted: 1 year ago.
Category: Ford
Expert:  James replied 1 year ago.

Hello, when this work was done was the degas bottle or cap ever replaced?

Customer: replied 1 year ago.
both have been replaced
Expert:  James replied 1 year ago.

This may be an instance where a phone call may help a lot more. Do you have a way to monitor coolant temp at all? Does it lose coolant driving in town? Do you ever hear the fan turn on?

Customer: replied 1 year ago.
Loses small amount of coolant in town. How do you know if fan turns on?
Expert:  James replied 1 year ago.

When the fan turns on it almost sounds like an air plane. They are very loud. If you fan isn't turning on when it needs to then that can be the cause of your concern.