Engine overheating, cylinder miss, loss of coolant with no apparent leak, white smoke from the exhaust especially at startup, oil level overfull, a white foamy substance on the underside of the oil fill cap, and bubbles escaping from the radiator, engine running, radiator cap off.
MLS head gaskets or o-ring the block/head
The 3.8 GM V6 is prone to blown intake gaskets much more than blown head gaskets. The blown intake gasket causes a loss of coolant which in turn causes overheating and a blown head gasket. The problem exists with most 2000 to 2003 vehicles equipped with the 3.8 Liter V6. There were defects in the upper intake manifold gasket, throttle body nuts, and the throttle body gasket.
You cannot repair a blown head gasket, you must remove the heads and replace the gasket.
Yes.
Its possible a quick fits
By the phrase "blown head", I'm assuming you mean blown head gasket. Head gaskets are fairly cheap (around $50), but it's a lot of work to replace. If you are doing it yourself, plan on spending several hours on it. If you send it to a shop, it could be well over $1,000.
around 2000 for both head gaskets and around 1000-1500 for one side only
Blown head gaskets.
No It's not very common.
Remove the head, Grind it flat and replace it using a new gasket.
YES. The intake gaskets have NOTHING to do with the head gaskets. It is a very common problem that the intake gaskets blow. It is not common for the head gaskets to leak unless the engine was over heated, and I mean HOT.
Head gaskets can't be repaired. If they fail they have to be replaced.