unloading coolant

[marktara]

Any ideas as to why my truck blows out enough antifeeze to turn on the low coolant light every time I'm driving on the highway and have to slow down for a stop sign or to turn a corner? I can drive around town all day and not loose any coolant but it seems if I take it up to highway speed then slow down it blows out some coolant.

[Kennedy]

Sounds like head gasket area pressurizing cooling system. Highway speeds generate enough volume to make it dump...

[eracers999]

One thing that comes to mind is if you have it too full to begin with. Pushes it out the overflow, just a little too much. Happens when the bottle is too cloudy to see the correct level.

[marktara]

I just replaced head gaskets and had heads pressure tested.

[G. Gearloose]

Depressurize, then Start it up, rev it, then feel the hoses, if they get firm, your repair is incomplete.