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1994-04 Mustang Parts
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1996-2004 Mustang GT 4.6 Heater & Coolant Hose Routing Diagram

Created by Tyler Rodriquez / 5 min read
Date Created: 4/16/2025
Last Updated: 4/7/2026

Easily find where your heater hoses and coolant hoses are on your 1996-2004 Mustang 4.6L engine with this quick and easy guide.

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  • 1996-2004 Mustang GT 4.6 Heater & Coolant Hose Routing Diagram
Use this detailed diagram to identify heater hoses and coolant hose routing on the 4.6L engine in the 1996-2004 Mustang GT. Learn the functions of the heater supply and return hoses, the heater tube assembly, the upper and lower radiator hoses, the thermostat housing, and the water pump to ensure proper cooling system flow and maintenance.

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Hoses & Function
  1. Heater Supply And Return Hose: The heater hose's main function is to transport coolant from the engine to the heater core which is located inside of the vehicle.
  2. Heater Tube Assembly: Keeps your coolant flowing perfectly and runs under the intake manifold
  3. Upper Radiator Hose: Connects to the thermostat housing to allow coolant to flow to the radiator for cooling.
  4. Thermostat/Thermostat Housing: The thermostat housing contains the thermostat, which opens up at a specific temperature to allow coolant to flow through the upper radiator hose, to the radiator
  5. Water Pump: Connected to the engine and part of the accessory drive. Its purpose is to circulate coolant through the cooling system.
  6. Lower Radiator Hose: Coolant travels out of the radiator into the lower radiator hose and back into the engine block to extract heat.
We hope this diagram will help with your coolant and heater hose routing needs! 


Thumbnail image of the author of this article, Tyler Rodriquez.

About the Author

Tyler has written content for Late Model Restoration for nearly 8 years, producing over 300 articles. As an avid New Edge fan, Tyler has owned 4 2004 Mustangs and an 88 Convertible Fox Body. Read more...