* One hose (usually the upper hose): This hose carries hot coolant *from* the engine to the heater core. You'll likely find it connected to a fitting on the engine near the thermostat housing or water pump. It often runs along the top of the engine and toward the firewall.
* One hose (usually the lower hose): This hose carries cooled coolant *from* the heater core back to the engine. This hose is usually located lower down near the firewall and connects to a fitting lower down on the engine block or intake manifold.
To be more precise: You'll need to consult a repair manual specific to a 1989 Chevy Celebrity. These manuals have diagrams showing the exact routing of the hoses. The location might vary slightly depending on the engine (2.5L or 2.8L V6). A visual inspection will be easier after you locate the heater core itself behind the dash (this involves removing some interior components). The hoses will run between the core and engine.
Important Note: Be careful when working near hot engine components. Let the engine cool completely before attempting any work on the hoses.
