[killer_mike]

I was wondering about that and asked the clerk at advance auto about the pump rotation and they said is not a reverse pump, it should rotate the same direction of the crankshaft wich is clockwise.
I will look for white smoke, check the dip stick, oil in coolant; coolant in oil.
But i see those bubles coming out when the caps is off and the up and down motion of the coolant level in the rad.
If theres no improvement, will have to take it in, dont know how to perform a leakdown test or compression test and dont have the equipment for it.

Hopefully is something simple, not the head gasket. And is there any chance that no fan shroud cause overheating on these trucks?

Originally Posted by mahanian

Did you have radiator cap off when it started splurting? If so, you can't really judge it by that because the cooling system doesn't work properly with the cap off. Also, every 1 psi of system pressure raises the boiling point 3 degrees so without the cap on your boiling point goes way down.

This might be a dumb question but are you spinning the water pump the right way? It's not a reversed serpentine pump or something like that?

Maybe you have a blockage in the block or heads. You can do a pressure flush, prestone sells a kit that uses your garden hose as the pressure.

You might have a trapped air pocket as well. You can burp the cooling system by putting the front wheels on ramps or something and run it for a few minutes without the radiator cap on, but don't let it boil. Just another possibility...