Car Smoking Problem 2002 Mazda 626 4 Cyc 2.OL?

So let me tell you the problem. I recently changed the timing belt, serpentine belts, water pump, oil, thermostat, PVC Valve, Fuel filter and attempted to change the coolant. The problem happened after I changed the coolant, it's temperature gauge isn't working and it's smoking out of the engine bay. I've checked the coolant system to make sure that it's not leaking and done everything I can think of doing to remedy the problem. The check engine light isn't on, so it's not throwing any codes. I need to know what to do because without the car I am helpless. I need to know what to do so that possibly I can fix it (I have some mechanical background), as I do not make enough money to pay for the inflated prices of a mechanic. Any help will be greatly appreciated.
 
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