What is the engine you are trying to replace the water pump in? If it is a 305/350 then you need to disconnect the negative battery cable, let the vehicle sit for atleast an hour so the cooling system can cool/depressurise, remove the rad fan and cluch (if belt driven) rad fan motor/blade/shroud assembaly (if electric), loosen the alternator and A/C compressor, remove the heater core hose that is connected to the water pump, remove the belts from the water pump (remember how they go back on),remove the 4 bolts holding the water pump to the block. Installation is reverse.
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Remove the belt from your 1999 Chevy Metro water pump. Remove the water pump return hose. Remove the water pump retaining bolts. Reverse the process to replace the water pump.
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Remove the belt from your 1998 Chevy 1500 water pump. Remove the water pump return hose. Remove the water pump retaining bolts. Reverse the process to install the new water pump.
Remove the belt from your 1987 Chevy Nova water pump. Remove the water pump return hose. Remove the water pump retaining bolts. Reverse the process to install the new water pump.