2004 f-350 6.0

[kirk1960]

hello everyone ..i have a heat problem when the truck is at normal oper temp and i catch a light or train i loose my heat i dont have any signs of smoke out of exhaust coolant level is at min mark so it wont come out degas bottle and there ars no signs of contamination to the coolant the system was flushed and heater core also including new thermostat ! and still the same ...i did notice as soon as you put the cap back on deges bottle it builds pressure almost instantly ..but not enough to go past the cap pressure release of 16lb is thi normal ? also all vacum lines seem ok ...

[Hivolts]

Subscribing....exact same problem started 4 days ago

[purplehorn1977]

its head gaskets. mine started doing this and once i did gaskets and studs it fixed it. the heads are pushing air into the system and its getting trapped in the heater core.

[Dave]

You loosing coolant?

[kirk1960]

not loosing coolant but just did combustion block test and it did turn yellow from blue so it must be head gaskets thank you all for your help !!!....how much is it to repair at a good diesel shop ?

[hugeredford]

I put a thermostat in mine and cured it. Cheap too!!!