Cooling system issues

[POWER-STROKER250]

Hey guys got a 08 f250 6.4 psd im having cooling issues. My radiator has a small leak and going down the road i see temps around 198-212 and when sitting still idling it drops to 168-175. Any help would be appreciated

[04hdfatboy]

Possibly the thermostat is stuck open and needs to be replaced.

[AllGo'N'Show]

Sounds like thermostats to me as well, doing mine tonight but don't have your issues, just getting it out of the way. I'll let you know how the job went

[MyTractorsSexy]

Replace the t stat... How small is the leak?

[POWER-STROKER250]

It leaks out about a gallon a month. Got the new thermostat and im having the radiator repaired next week

[POWER-STROKER250]

Do i have to replace that upper housing when i do the thermostat?

[AllGo'N'Show]

According to all my research and my thermostat package, no. They twist down and out like a radiator cap kind of. There is a nice video on youtube that you can see how to remove each thermostat from the housing.

[POWER-STROKER250]

alright cool thanks guys i appreciate yall's help!

[IOWASTROKER46]

I have a new radiator already, but was still using a gallon every 500 miles. Ford takes truck apart to replace the famous radiator hose and replace it with two "O" rings instead of one. Charged me $280 without a phone call prior to labor. I was upset. Now, down the road and used 2 more gallons. Any other ideas before I call Ford tomorrow AM. Going 3K miles to pick up new toyhauler this coming Friday.