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Some update:
I flushed the whole system. stuck my garden hose in the radiator, the thermostat housing, and the engine water intake hose as well as the expension tank hoses. they all flow freely. I even ran the engine with the garden hose in the engine water intake hose and it would come out the thermostat housing with great force, so I know (if I wasn't already convinced) that the water pump works good.
I went for a test drive and it all went well for quite some time but then... it happened again. all the sudden and for no apparent reason, it shot towards the red, went back down for a while then up again.
I made it home and touched the top hose... boiling hot... bottom hose... barely warm! clogged again! I can only think of one thing. the bottom hose is weak and it must be collapsing on itself under the engine suction. I had removed it and ran the garden hose in it but it was working fine then.
I'll get a new one on monday and see what happens.
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