Here are the steps on how to remove the water pump bolts on an 88 F150:
1. Disconnect the negative battery cable.
2. Drain the coolant from the engine.
3. Remove the fan shroud.
4. Locate the four water pump bolts.
5. Use a wrench to loosen the bolts.
6. Remove the bolts and then remove the water pump.
Be careful not to drop the bolts into the engine. If you do, you will need to fish them out with a magnet.
Here is a diagram of the water pump bolts on an 88 F150:
[Image of water pump bolts]