1999 Chevy S10

I couldn't find a heater hose diagram specific to the 1999 Chevrolet Venture with rear heat and air, but I can give you the general location of the heater hoses and how to identify which ones go to the rear heat. The heater hoses on a 1999 Chevy Venture are located on the passenger side of the engine compartment. There are two heater hoses, one that is hot and one that is cold. The hot heater hose will be connected to the heater core, which is located under the dashboard. The cold heater hose will be connected to the engine. To identify which heater hose goes to the rear heat, you can look for the hose that is connected to the heater core outlet that is labeled "Rear Heat." The other heater hose will be connected to the heater core outlet that is labeled "Heating Core Inlet." Once you have identified the heater hoses that go to the rear heat, you can reconnect them to the heater core. Be sure to use new clamps when you reconnect the hoses. Here are the steps on how to replace the heater hoses on a 1999 Chevy Venture with rear heat and air: Disconnect the negative battery cable. Drain the coolant from the radiator. Remove the heater hoses from the engine and heater core. Install the new heater hoses. Fill the cooling system with coolant. Reconnect the battery cable. Start the engine and check for leaks.

Tyrone, Check the attached links,instruction and guides, the last link has some very good info. and pics. on S10 heater core replacement. Good luck.
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Google up "1999 Suburban heater hose diagram...

Haynes manual has exactly what you need and is only $20(approx) and has many, many, many more diagrams.

http://www.haynes.com/products/productID/243

Hi,

Please check this webste:

http://www.youtube.com/watch?v=687B2pspF2w

Please accept if this helped you.

Thanks

http://www.fixya.com/cars/t3722263-change_heater_core_in_2001_chevy_blazer

on 1992 s10 remove the heater outlets and duck from under instrument panel. Remove air distribution model assembly,heater and seal. Disconnect neg batt cable. Drain eng coolant. Remove hoses at core. Remove rear case screws. Remove heater core from case.

heater core or leak on cooling system

1999 Chevy S10

you will have to remove the dash assembly and then the heater/a/c box it is in the hvac module.