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[C2] Bulging hose

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Old Sep 28, 2025 | 01:33 PM
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Default Bulging hose

1966 L75 327/300hp. Out for a long drive, temp gauge still not working so when I stopped
for a break, this is what the top radiator hose looked like. I have no idea how old the hose is.
It's goy a 15# new radiator cap and it's not puking coolant when the engine is off.
I'm thinking it's just an old hose.

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Old Sep 28, 2025 | 02:30 PM
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Yeah, the layers of the hose are breaking down and a bubble of coolant has gotten in there.
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Old Sep 28, 2025 | 03:11 PM
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What he says….^. It will probably blow…..eventually. Hoses are so much more reliable today than they were back in my formative years. Seems like hoses blew all the time back then.

Last edited by DonBond; Sep 28, 2025 at 03:29 PM.
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Old Sep 28, 2025 | 03:25 PM
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Time for a replacement.
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Old Sep 28, 2025 | 03:58 PM
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I wasn't referring to the little zit but the last 6" where it joins the intake. I ordered a new on anyway. Can't let my wife spend all my money.
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Old Sep 28, 2025 | 04:14 PM
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Originally Posted by Captain Bud
I wasn't referring to the little zit but the last 6" where it joins the intake. I ordered a new on anyway. Can't let my wife spend all my money.
The rubber is fatigued, so it will expand under pressure and take a set.
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Old Sep 28, 2025 | 08:22 PM
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Its usually always the top hose doing that from having air in it from time to time , you never see a bottom hose go bad like that because it is full of coolant all of the time.
Bob
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Old Sep 28, 2025 | 09:19 PM
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Originally Posted by Captain Bud
I wasn't referring to the little zit but the last 6" where it joins the intake. I ordered a new on anyway. Can't let my wife spend all my money.
ah, I see that now. Likely the same thing with the layers breaking down and swelling the outer rubber.
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Old Sep 29, 2025 | 09:38 AM
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My factory upper hose did that in Colorado when it was only 5 years old during my honeymoon in May '81...
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Old Sep 29, 2025 | 08:43 PM
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I'd replace all of the hoses and all of the coolant while at it.

Live well,

SJW
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Old Sep 30, 2025 | 01:01 AM
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Ive seen where some use anti-sieze on the hose fittings. Assuming its purpose is to reduce corrosion?
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Old Sep 30, 2025 | 10:25 AM
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And/or to facilitate easier removal in the future, although this is the first I've heard of using anti-seize at hose connections. I use a very thin swipe of dielectric grease to keep 'em from sticking. It's especially helpful years later when separating hoses from heater cores that don't well tolerate a lot of twisting, tugging and prying.

Live well,

SJW
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