Where are the heater hoses 1999 Cadillac sts?

In a 1999 Cadillac STS, the heater hoses are located at the rear of the engine compartment, connected to the engine and the heater core. One hose carries coolant from the engine to the heater core, while the other returns the coolant back to the engine. Accessing them may require moving some components, such as the air intake or other engine covers, depending on your specific model configuration. Always ensure the engine is cool before attempting any maintenance on the hoses.