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Here's a couple of other thoughts.
1. The front fans have 'ballast' resistors in their circuits. If these fail, the fans will not operate in low speed and assist in cooling. You can test these in the following way. With the engine cool, start the car with the AC on. You should hear the fans running in low speed on both sides. If not, then you either have a failed ballast resistor on the side the fan isn't running or a broken fan.
2. When the car gets hot, do you ever hear the fans run in high speed. If both fans don't run in this mode, I would suspect you have a bad temperature sensor in the cooling system. If one comes on and the other doesn't, this might be a clue that you have a broken fan on the non-running side
3. You might have air trapped in the cooling system after the refill when the water pump was changed. Other post suggest how to bleed the system.
4. Is the amount of fluid in the tank staying at the same level? If not, it could be lowering as trapped air releases though the value. Or, it could be you have a leak somewhere in the system. A pressure test will help you find out if this is the case.
Hope these ideas help
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