Where is the heater inlet hose located on 2003 Chevy venture?

The heater inlet hose on a 2003 Chevy Venture is located on the engine side of the firewall, near the heater core. It's a hose that carries hot coolant *from* the engine *to* the heater core. To be more precise without seeing your specific vehicle:

* Look for a thick hose (usually a rubber hose) connected to a metal fitting on the firewall. This fitting is part of the heater core.

* Trace the hose back towards the engine. It will likely be near the thermostat housing or water pump area.

* The hose leading *towards* the firewall from the engine is the inlet hose. The hose going *away* from the firewall is the outlet hose.

Because the location can vary slightly depending on trim level and specific engine, you may want to consult a repair manual specific to your 2003 Chevy Venture or use an online repair database with diagrams for better visualization. A simple online search for "2003 Chevy Venture heater core diagram" should yield useful results.