Heater hose diagram needed

  • 2001 FORD F-150
  • 5.4L
  • V8
  • 2WD
  • 226,000 MILES
Got a coolant leak somewhere. Truck drives fine, coolant temperature gauge stays in middle. But after parking truck overnight, we find coolant puddle on driveway, below where front passenger sits? Used coolant dye and located a small puddle of coolant, under the cab (not inside) way down on the bottom or below the firewall, on the front passenger side of engine bay. No wet carpet or smell of coolant inside cab so probably not the heater core. Neighbor said some Ford's with the 5.4L have a heater hose that runs from the back of the water pump, under the intake manifold, that routes back to one of the heater hoses going through the firewall. Neighbor said leaks from this hose frequently leak down into this area. Can't find any information, or heater hose diagrams for my truck listed above Supercrew, 5.4L/2V engine, or if this even applies to my motor. Need help diagnosing leak location, heater hose diagram, and if my truck has a hose under the intake diaphragm.
Do you
have the same problem?
Wednesday, February 17th, 2021 AT 3:10 PM

1 Reply

The best way to find these rather then trying to inspect all the hoses is to just pressurize the system and that will push the coolant out where the leak is. This will allow you to locate the leak and not have to get the engine hot.



I attached the process from the manual on this info. Unfortunately they don't have a diagram of all the hoses but again, once the system is pressurized, you should be able to track it down.

Let me know if you have questions. Thanks
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Thursday, February 18th, 2021 AT 5:37 PM

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