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Water Pump hose connections

Discussion in 'Chevy Trucks' started by 75gmck25, Jul 5, 2005.

  1. 75gmck25

    75gmck25 Senior Member
    Messages: 119

    I have a '75 GMC with 5.7 engine and I'm considering switching to a serpentine belt system that came off a '99 GMC.

    On my '75 water pump the only hose is the lower radiator hose. My heater return connects to a small hose connection on the radiator.

    On the '99 water pump there are also two small (5/8"?) hose connections on the top of the water pump. Each connector seems to point to the opposite side of the truck. What do each of these connect to?