| to check the fan clutch just let it idle until it warms up or even begins to go to the red and if the fan is not raoring then you prolly need a new clutch. if you can stop the fan with your hand when it is getting to the hot range then you defiantly need a fan clutch. to check the water pump fo flow take off the radiator cap and start the engine. then rev the engine up to about 2000 rpm or highere and coolant should be shooting into the expansion tank from the top of the hole where the cap screws on. there isn't really a good way to check the T-stat. but i would bet that is is the water pump if it has never been changed before. if you do change the water pump put a new t-stat in at the same time it could save you trouble down the road and your already taking things off in that area so it won't be much trouble.
oh one other thing. it could be an air pocket in the cooling system. how did you bleed the system when you flushed the rad? the way to do it is fill it up with the bleeder screw/s out untill coolant comes out of them and no more bubbles. then put the screws back in and continue to fill it up until no more bubbles come out of the expansion tank. then start and run the engine between 2000 and 3500rpm with the heater on. and run it untill all the bubbles come out. it can take a while. but once you get all the air out of the system you should be able to add more coolant to it. | 
