Coolant leak

Tiny
67BUGMAN
  • MEMBER
  • 2001 FORD EXPEDITION
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
Yesterday I noticed a coolant leak from the rear on the vehicle after I could smell antifreeze while I was warming up the truck. I found the leak coming from one of the aluminum coolant lines that leads to the rear heater core. I pinpointed it to a pinhole in in one of the lines near the passenger side rear spring at one of the plastic mounting brackets that secure the 4 lines to the truck. Upon a little research it appears to be the “Rear Heater Inlet Line.” I am planning on doing a temporary repair to the line but can not seem to find a part number for the line anywhere. I have seen others have had this problem as well and was wondering if anyone can help me find the replacement line part number. All I can seem to find is the heater lines located in the engine compartment. Thanks for any help to whoever has an answer to this.
Monday, February 27th, 2023 AT 7:34 PM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

I'll try my best to help. I tried finding the part by looking through my manual. However, they indicate several auxiliary heater inlet lines. Could you take a look at the pics I attached below and let me know if you see what you need? Let me know the number shown.

I did find a few steel lines at O'Reilly's auto parts. But I'm not sure which I am looking for.

Let me know.

Joe

See pics below.
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Tuesday, March 7th, 2023 AT 8:05 PM
Tiny
67BUGMAN
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Thank you, Joe. Yes, I have seen these images which is how I figure the term they used for it. In the images 15, 26, and 27 are all the inlet line. The problem is first of all there are no part numbers. Secondly the image appears to be showing the rear of the vehicle by what looks to be a fender well at the bottom of the picture. With that being said, it shows the lines coming down the driver's side of the vehicle, across the rear to the passenger side where they would meet up with the rear heater core. The problem is, the lines run down the passenger side, across the rear to the driver's side where my rear heater core actually is. It’s backwards which makes me wonder if that is the correct year and make. I have also looked at the inlet lines at just about every auto parts store and all I have found are the ones in the engine compartment, even though they are for the rear. They are very short of you look at them. There must be a connection around the firewall I just haven’t looked there yet. What I have seen on my truck is they leave the rear heater core and have no connections to be seen as far forward as I have looked. They disappear above the exhaust shield and frame around the paddy rear door.
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Wednesday, March 8th, 2023 AT 10:12 AM
Tiny
67BUGMAN
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  • 6 POSTS
Sorry Joe. Around the passenger rear door is as about as far as they can be seen without taking a lot of parts off the bottom of the truck. I’m going to be digging into it more either later today or tomorrow because I just haven’t had time, but I do need my truck back running again. I was tempted to just eliminate the rear heater for now at the “Tee” connections under the hood but that’s not going to be very easy or safe either without damaging the hoses.
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Wednesday, March 8th, 2023 AT 10:17 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

No problem whatsoever. If you know where the steel line is leaking, you may want to consider cutting the bad section off and placing a section of high-pressure fuel line in its place. That would work for some time. However, if you do this, make sure the clamps you use are designed for fuel injector hose (high pressure). You will never reach the pressures for failure, but the style clamp will prevent it from leaking.

Let me know what I can do to help.

Take care,

Joe
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Wednesday, March 8th, 2023 AT 7:05 PM
Tiny
67BUGMAN
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That’s what I actually did yesterday. When I got in there to it I found that it was a little more than a pinhole, but the clamp was hiding it pretty well, I guess. I used a re-enforced heater hose and not the cheap clamps. Ran it at idle for about 20 minutes last night and it was nice and warm but will probably take it out today.
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Thursday, March 9th, 2023 AT 5:24 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

You do nice work. Very neat and organized. I would suspect that will outlast the steel tubing. Drive it for a while and if there are no leaks, leave it just the way you fixed it.

If anything changes, let me know.

Take care of yourself and feel free to come back any time in the future.

Joe
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Thursday, March 9th, 2023 AT 7:50 PM
Tiny
67BUGMAN
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Thank you so much for your help with this Joe. I will keep you updated if anything ever changes. There is another one of those brackets directly above the spare tire as well and the pipe was in very poor condition there too, so I did the same thing on that one as well. Thanks again and pass the help along to anyone who has this problem in the future cause I’m sure there are more out there with the same issue. Funny how out of all 4 lines that bracket secures only the coolant inlet line was in bad shape. All other 3 looked fine.
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Friday, March 10th, 2023 AT 7:26 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

You are very welcome. I agree it's odd that there is only one that failed. Often times, when they are mounted in a bracket, they all fail there.

Regardless, take care and enjoy the heat. LOL

Joe
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Friday, March 10th, 2023 AT 9:19 PM

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