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I don’t know what could be causing your problem but I do sugget that if you have one of those clicking type radiator/coolant reservoir caps THROW IT AWAY! They are junk and most of the time don’t hold any pressure, get a $5 replacement from any autoparts store.
As a side note, that could also cause a loss of coolant.
Oscar.
You might have some air trapped in the system, as others suggested.
Are you loosing any coolant? The water pump could also be bad, there is a bleed hole at the front of it, behind the pulley. You’ll need to remove the pulley and get under the car or use a mirror and a light to take a look at it. If it’s OK, the next thing I would think is a bad lower intake manifold or head gasket.
3.4 engines are known for cooling system problems, specially lower intake manifold gaskets. You’ll need to have your cooling system pressure tested or if the gaskets haven’t been replaced, it would be a good time to just go ahead and do it…
Oscar.
You might have some air trapped in the system, as others suggested.
Are you loosing any coolant? The water pump could also be bad, there is a bleed hole at the front of it, behind the pulley. You’ll need to remove the pulley and get under the car or use a mirror and a light to take a look at it. If it’s OK, the next thing I would think is a bad lower intake manifold or head gasket.
3.4 engines are known for cooling system problems, specially lower intake manifold gaskets. You’ll need to have your cooling system pressure tested or if the gaskets haven’t been replaced, it would be a good time to just go ahead and do it…
Oscar.
How about pouring some hot water on it and see if it budges. The locking mechanism on the cap might become rusty (and damaged) but it’s either that or drilling it out . Either way you’ll need a new one…
Another option would be to push it with a small flat head screwdriver.
Oscar.