1998 Mazda Truck

Engine Cooling problem
1998 Mazda Truck 4 cyl Two Wheel Drive Manual 202000 miles

I just bought my truck for $600 and fully rebuilt the engine. I got new themostat replaced all cooling hoses drove it about 146miles runing to cool so I took themostat out to see it was stuck open it wasent put it back it now when driveing it seems to get a little to hot im worried the engine is going to blow up on me can you give me some tips on fixing my problem?
April 8, 2008.

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