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Are you sure the two electrical plugs to the thermostats housing are around the right way if you disconnect the pipe to the the bottom of the radiator does coolant flow out(if you try that make sure you have coolant to replace it).

If your coolant is really reaching 141°c your coolant should be boiling.

 

Make sure that the water pump drive is engaged. The waterpump is driven by a friction wheel that rubs against the back side of the serpentine belt. There is a tab that is pulled to allow the belt to be replaced (it retracts the friction wheel), this tab must be pushed back into place or the water pump will not spin. If you look at the waterpump (passenger side of the engine), if you see a piece of flat steel wire (1/4" wide) with a plastic tab on the end, push it back in. You should not be able to see the steel wire.

The second thing is to make sure that the system was bled after filling. There is a bleeder on the thermostat housing, it is a plastic hex head bolt with a recessed 'X' in the top of it. Look between the valve cover and air intake hose with a flashlight. With the engine running, open the bleeder screw 2-3 turns until some air and coolant comes out. Be careful not to open the bleeder screw too much, it can come out (supposedly at about 4 turns). Once you have a steady stream of coolant coming out of the bleeder, then close the bleeder screw and you should be all set.

There are how-to threads on water pump replacement and thermostat replacement that will have pictures of the parts that I described, search the forum if you don't understand what I'm describing.

I'm pretty confident that these two things will solve your issue. Keep an eye on the coolant level. You may need to bleed it two or three times if everything is new.

Good luck,
Mike

 

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