Heater coolant lines are found under the hood and transfer coolant from the engine to the HVAC system. The lines may be mounted directly to the engine or mounted in the engine compartment itself. Heater lines are made of aluminum and brackets may be welded or brazed. Tube sizes range from ½” (12.7mm) to 7/8” (22mm) diameter. Many assemblies have attached hoses, constant tension clamps, crimps, grommets, bolts and gaskets.
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