HVAC Heater Hose. Molded Heater Hose. It can be used for coolant, water and air applications, also approved for marine applications. Heater Outlet. The engine types may include 3.0L 2997CC V6 GAS SOHC Naturally Aspirated,3.2L 3210CC V6 GAS SOHC Naturall y Aspirated.