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Cooling leaks at hose to housing connections #5267093 11/14/19 12:53 PM
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Fitz98 Offline OP
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I have 2 places on my 98 Expedition 5.4 where the cooling hoses connect to the metal housings and have very slow leaks, 1 drop over the course of minutes.
I am confident the hose clamps are tight.
I feel like there may be some pitting or minor corrosion on the metal parts contributing to this.
Any ideas what I can put on the metal housing connection points that could help create a more positive seal where the hose wraps over the metal?

Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267109 11/14/19 01:01 PM
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JC1 Offline
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What are the age of the hoses? Are those Screw type clamps or the spring type clamps?

Last edited by JC1; 11/14/19 01:01 PM.

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Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267119 11/14/19 01:08 PM
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Fitz98 Offline OP
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New hoses
Screw type clamps

Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267131 11/14/19 01:20 PM
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Ursatdx Offline
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Clean any corrosion on metal housings with wire brush.
Use 2 clamps if there is room.


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Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267140 11/14/19 01:28 PM
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mk378 Offline
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Even with some pitting, you should be able to get a seal if there's no loose material. Use constant tension clamps.

Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267227 11/14/19 02:49 PM
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Dave9 Offline
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Are these the factory hoses? 22 years old...

For there to be any significant corrosion (more likely dried coolant scuzz if not both) the coolant and/or air had to get to the mating surface of the metal. Odds are high that your hose(s) are cracking from the inside out and may even get worse if you pull them off to clean and reattach the same hoses.

Fortunately it is a slow leak so if you don't mess with it, it will probably be fine till you get a chance to order new hoses, but do keep an eye on coolant level.

Last edited by Dave9; 11/14/19 02:52 PM.
Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267250 11/14/19 03:14 PM
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Anduril Offline
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The metal surfaces where the hoses connect probably have mineral deposits on them, causing the surface to be uneven. Take the hose off, go over the surface with some sandpaper, and you might as well get a new hose if it's the original from 1998.

Last edited by Anduril; 11/14/19 03:16 PM.

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Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267256 11/14/19 03:23 PM
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Redright9 Offline
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Any chance the barbs where the hoses connect are flattened at all? Like others have said, new clamps maybe, old ones can get misshapen easily. Clean the area where they attach, and snug them up. Should be fairly easy, other than loosing a little coolant.

Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267258 11/14/19 03:26 PM
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Mad_Hatter Offline
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Permatex does make a metal filler but I don't know that that's what you need. I think taking a wire brush to the housing, new hose and maybe new clamp(s) if it doesn't look like the old clamps are working, should fix your problem. Permatex also makes a water pump and thermostat rtv (used in lieu of a gasket or as a gasket dressing) but I've never used it out of fear that it would make getting a stat or hose off a PITA.

In reality there's no reason why a hose shouldn't form a water tight seal if everything's clean and tight. Are you 100% certain it's at the hose point (of connection) and not the stat leaking and the leak is "traveling"? Did you recently service the thermostat??

Last edited by Mad_Hatter; 11/14/19 03:29 PM.
Re: Cooling leaks at hose to housing connections [Re: mk378] #5267275 11/14/19 03:44 PM
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Yah-Tah-Hey Offline
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Originally Posted by mk378
Even with some pitting, you should be able to get a seal if there's no loose material. Use constant tension clamps.

Right you are 378. OEMs use the Mubea type constant tension clamp for a reason. They are almost bullet proof. Never have had a problem with one.

Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267314 11/14/19 04:43 PM
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Farnsworth Offline
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Spring type OE clamps won't leak where screw type will. The spring expands and contracts keeping constant tension, and the screw type doesn't. l went to a junkyard and got some OE Toyota clamps once for the same reason you are having.

Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267325 11/14/19 04:52 PM
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MasterSolenoid Offline
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What type of Spring Clamp (constant tension) are people referring to ?

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Last edited by MasterSolenoid; 11/14/19 04:53 PM.

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Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267345 11/14/19 05:05 PM
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The best thing for a pitted hose nipple is good ol' Permatex Aviation Forma_Gasket. goop it on good. The hose will go back and not leak. Should you ever want to remove the hose, it will slide right off. It is non-hardening.. It is what there was pre- RTV grin2


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Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267373 11/14/19 05:25 PM
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tiger862 Offline
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Put stop leak in radiator


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Re: Cooling leaks at hose to housing connections [Re: Fitz98] #5267410 11/14/19 06:04 PM
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Trav would recommend hylomar. (where are you Trav?)


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