Fixed o2 sensors, now car is heating up???

After fixing my o2 sensor problem, my check engine light finnaly turned off...but now the car is heating up way beyond what it did before the o2 fix...also at this time, I removed the underhood noise deadener and the plastic piece that bolts under the car to the radiator I think....its that piece that you know always scrapes (lowered cars) I think it is ment to draw air in to the radiator...but I dont think those two little things would cause the heating...could it have to do with the 02's??? help!!
 
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It is city driving but could that air dam cause such a drastic change in heating?? it's not overheating, but close....I once heard that the o2 problem could cause a car to run in open loop...meaning that the waterflow continuously flows... I think...??? so now that the o2 is fixed its not running in open loop...could that be the proble??/ I have aluminum radiator, griffen e-fan, hv water pump, 180therm and 100degree Cali weather!!!