looking for heater hose diagram

Rich_007 · Jan 22, 2018

2001 5.4 xlt
I have a small coolant leak. I am hoping it is just a hose. Tried some stop leak which didn't seem to do any good. Figured I better fix it instead of clogging things up by trying more stop leak. Searched for heater hose diagram on here and struck out. I tried to identify the culprit but the hoses seem just out of view on the rear of the engine on the passenger side. The small part of them I can see from above show no sign of leakage and underneath I cant identify the location since it is just running along some parts and dripping off the lowest point somewhere around where the tranny mates up to the engine. Since i have heat and no coolant smell in the cabin I am thinking and hoping its just a hose and outside the firewall. Right now it only leaks sometimes. Seems to be related to ambient temp. Guess something (hopefully rubber, not metal) is expanding or contracting and letting the fluid out. About once a week I need to add about a half a gallon to the reservoir. I put the stuff i need to do a bypass in the car in case something blows before I get it repaired. Looks like i am going to have to climb on top of the engine to get these hoses changed and am trying to collect info in hopes of getting this diagnosed and repaired/replaced without getting into it multiple times.

1955moose · Jan 22, 2018

Well's here a thought! If you know what hose it is, why not go by a dealership, or parts store, and purchase said hose. If its a straight piece of coolant hose, why not pull it, bring it to your local parts store, measure inside diameter, buy a hunk of hose. Unless I'm missing something in your post, like you live in the boonies, and don't have another vehicle to chase parts, seems like an easy fix.

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Rich_007 · Jan 23, 2018

Don't know which one it is yet, or of course I would just go buy it and put it on.
Was looking for some info. Guess I didn't explain it very well.

1955moose · Jan 23, 2018

Well the proper way to do your hose pressure test, as we've stated in the past, is to pressurise tank, observe for leak, done deal. Stant makes a nice one, is what I've used, or have a shop do. Otherwise your chasing your tail. Fun for a dog/cat, not so much for humans!

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Rich_007 · Jan 24, 2018

Yeah, that's what I am going to have to do. When I was at Autozone buying the stop leak a while back, they gave me a pressure kit to test it right there. I couldn't seem to make it work. Was pretty sure I had the right cap, but the thing wouldn't build up any pressure. I didn't have enough time to mess around with it and figure out why it wasn't working. I will try that again, if I strike out, I will just start taking the hoses off until I find it. Never had a leak like this I couldn't find within two minutes.
Thanks.

1955moose · Jan 24, 2018

Sometimes you develop a small, or pinhole leak, that only shows itself under pressure. You might want to have a small local shop pressurise your system for you. Removing an old hose, then replacing it, is trouble just waiting to happen. If your going to replace hoses, replace all of them. As stated in another post, Its advisable to replace all heater hoses every4-5 years. The exception would be silicone hoses but those are usually for performance vehicles.

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GaryA · Jan 28, 2018

Rich_007 said:
2001 5.4 xlt
I have a small coolant leak. I am hoping it is just a hose. Tried some stop leak which didn't seem to do any good. Figured I better fix it instead of clogging things up by trying more stop leak. Searched for heater hose diagram on here and struck out. I tried to identify the culprit but the hoses seem just out of view on the rear of the engine on the passenger side. The small part of them I can see from above show no sign of leakage and underneath I cant identify the location since it is just running along some parts and dripping off the lowest point somewhere around where the tranny mates up to the engine. Since i have heat and no coolant smell in the cabin I am thinking and hoping its just a hose and outside the firewall. Right now it only leaks sometimes. Seems to be related to ambient temp. Guess something (hopefully rubber, not metal) is expanding or contracting and letting the fluid out. About once a week I need to add about a half a gallon to the reservoir. I put the stuff i need to do a bypass in the car in case something blows before I get it repaired. Looks like i am going to have to climb on top of the engine to get these hoses changed and am trying to collect info in hopes of getting this diagnosed and repaired/replaced without getting into it multiple times.

I had a similar leak in that area. Behind the water pump there is a rigid coolant line that passes under the intake and comes up at the rear of the passenger head. Mine had a crack in the rigid line causing a leak from the rear of the engine but very hard to see. I had to remove the intake and cut the line just behind the water pump and run a flexible hose back to the T bypassing the rigid set up. Not saying thats what your is, but it is a fairly common issue to deal with.

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Rich_007 · Jan 28, 2018

This the rigid hose you are talking about? (found this pic on the net)

Didn't know one ran under the intake. Thought I was losing my mind, looked at it once or twice and kept thinking, where the F%$^ is the other heater hose. But I didn't climb on top of the motor to get a good enough view. Between being busy and the fact we aren't supposed to be working on cars in the apartment parking lot, If the intake has to come off I will probably skip the risk of something going wrong and the job turning into something I cant deal with in the parking lot and end up having it towed to the shop anyway. The good news about that is I found a local shop that seems to be honest and reasonable, (I figure that's as good as it gets for a mechanic). They did my fuel pump a couple weeks ago. Hopefully will be able to get into it later in the week.

GaryA · Jan 28, 2018

Rich_007 said:
This the rigid hose you are talking about? (found this pic on the net)View attachment 23552
Didn't know one ran under the intake. Thought I was losing my mind, looked at it once or twice and kept thinking, where the F%$^ is the other heater hose. But I didn't climb on top of the motor to get a good enough view. Between being busy and the fact we aren't supposed to be working on cars in the apartment parking lot, If the intake has to come off I will probably skip the risk of something going wrong and the job turning into something I cant deal with in the parking lot and end up having it towed to the shop anyway. The good news about that is I found a local shop that seems to be honest and reasonable, (I figure that's as good as it gets for a mechanic). They did my fuel pump a couple weeks ago. Hopefully will be able to get into it later in the week.

I took the intake off to make sure that it wasn't a blown intake gasket at the rear water jacket, check the other coolant lines, etc. I've heard of some that have fished a coolant line through, not real sure how they cut the rigid line cleanly though. Ive found just doing it the right way the first time saves headaches in the long run....no matter how bad i want a short cut. Plus its a good time to replace plugs and inspect coils. With a coolant leak back there, my #4 plug well was filled with coolant and needed cleaned out. Anyway, hope this helps. Good luck.

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98eb5.4 · Jan 28, 2018

you can run a line tapping into the front with an elbow, then running it outside to the back, without pulling the intake off, plenty of vids out there on it

lotsa vids out there also how easy it is to deal with the quick disconnects at the heater core but also lotsa info that sez impossible without a special tool, which was my experience,

hose selection can get complicated cos some setups have rear heat & some hoses come with the quick connects crimped on vs universal hose clamp type fittings, that can end up not fitting

i'd stick with the motorcraft parts with crimped on quick disconnects if (leaking) having to go there, but just splice in a fresh line using an adapter & hose clamps, for a temp fix

looking for heater hose diagram

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