* Upper Heater Hose: This hose carries hot coolant *from* the engine to the heater core inside the car. It's usually thicker and will be connected to a fitting on the engine near the thermostat housing or upper radiator hose connection. Follow the hose from the engine towards the firewall.
* Lower Heater Hose: This hose carries cooled coolant *from* the heater core *back* to the engine. It's usually thinner and connected to the bottom of the heater core (which is behind the dash) and another fitting on the engine, often lower down than the upper hose connection. You'll likely see it disappearing behind the engine or near the water pump.
To find them precisely:
1. Consult a repair manual: A Haynes or Chilton manual specific to your 1995 Pontiac Grand Am will have diagrams showing the exact location and routing of the heater hoses. This is the best way to be sure.
2. Look for thick rubber hoses: They'll be relatively thick and typically black or dark in color.
3. Trace them from the engine: Start by looking near the thermostat housing and the water pump on the engine. Follow the hoses as they go toward the firewall. You may need to use a flashlight.
Caution: The coolant in the hoses is hot when the engine is running. Let the engine cool completely before working on the hoses to avoid burns.
