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Discussion Starter · #1 ·
Was wondering if anyone out ther could walk me through replacing rear heater core lines....due to a coolant leak in the rear of my 2001 expedition? are there any diagrams available anywhere? thanks
 

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There is a couple ways you can fix this but you need to find the source first. Are you sure it's leaking at the lines or the heater core? Roll under the truck and take a look.

There are 4 lines running to the HVAC compartment in the rear, 2 AC and 2 heater core lines. All 4 originate in the engine compartment. All 4 are made from aluminum but the coolant line change to rubber where they enter inside the truck. Also, there is a drain tube to get rid of the AC condensate (water), a heater core leak may drain from there too. However, most leaks that occur under the truck usually form at the clamps that hold them to the body/chassis from corrosion.

You can cut out the corrosion then splice in a piece of rubber. New lines are over $200 and require a lot of work to install.

Let us know where you find the leak, someone will post a diagram for you.
 

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Discussion Starter · #3 ·
thanks for the quick reply....my problem is draining form the excess drainage line ....does this mean that i have to replace my rear heater core or do i need to do more trouble shooting? i have brokedown the rear compartment and can see no visible leaks around the lines coming from the heater core.....stumped ...will be checking this forum in 15 min increments for help ....thanks a million
 

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Yep, it's most likely the heater core. You can pressurize the cooling system or fire it up and wait for it to build pressure. The leak should become visible.
You might need to evacuate the AC to get at the heater core. Have you poked around under the truck just make sure where it's coming from?
 

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If it is the heater, and leaking in the core, you will have smell/steam from the rear vents. It could be aa attatching heater pipe, but seems unlikely.
 

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Hi- so to add to this, we've got an 01 expedition also and have the same issue with a rear line leaking. But it's up under the cross member frame where it's leaking.

Is the best way to cut the line on ether side of the frame and run another hose?
What a pain!!!!!



Yep, it's most likely the heater core. You can pressurize the cooling system or fire it up and wait for it to build pressure. The leak should become visible.
You might need to evacuate the AC to get at the heater core. Have you poked around under the truck just make sure where it's coming from?
 

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Welcome to the FFO.

If you are not replacing the entire line, cutting the existing line and adding in a section of replacement line would be a way to do that. Once the old line is removed, use it as a pattern for the new line. A shop manual will have some detail as to removal.

For $27 this would be a steel. I paid four times that for shop manuals on my 2006 Navigator. http://www.ebay.com/itm/2001-EXPEDI...ash=item2cb445be7b:g:KwYAAOSwLnBX4X9G&vxp=mtr


>>>>>>>>>>>>>Action
 
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