Dumb: Why does my lower radiator hose keep slipping off? - Chevelle Tech
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post #1 of 24 (permalink) Old Jul 17th, 06, 1:17 AM Thread Starter
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Dumb: Why does my lower radiator hose keep slipping off?

This is really bugging me. My old lower rad hose popped off after a long trip, when I parked the car. I reattached it ( band/screw clamp) and figured it was a fluke. It happened again. Then again. Bought a new hose. Same thing.

The radiator outlet has a rubber soft grommet or something up against the tank wall. It's as if the hose is being slowly forced off the end of the outlet. If I really crank down on the clamp, you can already see the end of the hose creeping away from the tank. What the heck is going on? The outlet looked in pretty good condition, but it does seem like it's "loose" inside the rubber grommet that goes through the tank wall. When tightened up, nothing leaks, until it blows!

Does this sound like a blown head gasket? Over pressurizing the coolant system? (please no, please no, please no)

pete
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post #2 of 24 (permalink) Old Jul 17th, 06, 9:48 AM
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Re: Dumb: Why does my lower radiator hose keep slipping off?

there should be a wire spring inside the lower rad hose to keep it from collapsing. If its not there it can suck the hose closed then the water pump will pull the hose off.
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post #3 of 24 (permalink) Old Jul 17th, 06, 10:02 AM
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Re: Dumb: Why does my lower radiator hose keep slipping off?

There shouldn't be anything on the raditor inlet hose stub other than the lower hose unless it's diameter is too small and it needs a bushing.

Maybe it's too slick, I've heard that the hose will blow off the water pump if painted.
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post #4 of 24 (permalink) Old Jul 17th, 06, 3:30 PM Thread Starter
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Re: Dumb: Why does my lower radiator hose keep slipping off?

Quote:
Originally Posted by Dean
There shouldn't be anything on the raditor inlet hose stub other than the lower hose unless it's diameter is too small and it needs a bushing.

Maybe it's too slick, I've heard that the hose will blow off the water pump if painted.
Maybe it's slick. Ihate to drop that hose again as it's a pain recovering all the coolant from the radiator (the radiator drain plug is even worse!). The old hose was too big, and there was some kind of bushing around the lower radiator opening that was the consistency of tar-paper (at least it was after years of use). The disintegration of that bushing probably caused the first leak. The new hose has the correct 1.5-inch opening. But the soft-rubber grommet has me bewildered... and seems to interfere with the hose end.

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post #5 of 24 (permalink) Old Jul 17th, 06, 3:49 PM
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Re: Dumb: Why does my lower radiator hose keep slipping off?

Pete, does the tube on the radiator have a good rolled bead on it? The hose should slip on the fitting far enough that the clamp will be on the front side of the bead so that it can't slip back. If it doesn't have a bead on it, a radiator shop may be able to solder a new fitting into the radiator. And, like Dean said, there shouldn't be anything on the hose tube but the hose.

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post #6 of 24 (permalink) Old Jul 17th, 06, 6:37 PM
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Re: Dumb: Why does my lower radiator hose keep slipping off?

Maybe it's because your driving to fast see other post Pete

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post #7 of 24 (permalink) Old Jul 17th, 06, 8:13 PM
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Re: Dumb: Why does my lower radiator hose keep slipping off?

One... no, two words, two clamps.

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post #8 of 24 (permalink) Old Jul 17th, 06, 8:54 PM
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Re: Dumb: Why does my lower radiator hose keep slipping off?

And scuff up the tube with some sandpaper or emory cloth.

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post #9 of 24 (permalink) Old Jul 19th, 06, 5:17 PM Thread Starter
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Re: Dumb: Why does my lower radiator hose keep slipping off?

Quote:
Originally Posted by Ark68SS
Pete, does the tube on the radiator have a good rolled bead on it? The hose should slip on the fitting far enough that the clamp will be on the front side of the bead so that it can't slip back. If it doesn't have a bead on it, a radiator shop may be able to solder a new fitting into the radiator. And, like Dean said, there shouldn't be anything on the hose tube but the hose.

BillL
It does have a rolled bead Bill, and I try to put the clamp behind the bead. But there's something weird about this grommet-thingy. I am gonna try to get after it again tonight, maybe I can post a picture. I gotta get it running. My daughter needs to drive the crappy minivan, so I'll be FORCED to drive the chevelle for a while .

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post #10 of 24 (permalink) Old Jul 19th, 06, 8:32 PM
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Re: Dumb: Why does my lower radiator hose keep slipping off?

I have the bushing also. Stock 396 rad for 69. I haven't had any issues with mine yet,
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post #11 of 24 (permalink) Old Jul 19th, 06, 8:42 PM
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Re: Dumb: Why does my lower radiator hose keep slipping off?

It seems like it would take a lot of force to pull off a hose that has a good and tight hose clamp behind that rolled bead. Is it really a grommet or is it a sleeve? I have never seen any grommets on the tube, only thing I have seen is a rubber sleeve, where someone had been jury rigging it when using a hose that was too big for the tube. That tar paper you're talking about sounds like a similar contraption.

I haven't seen what it looks like (a picture would be good), but I would say that your best bet is to remove whatever you have got on the tube right now, and then make sure that the hose still fits snugly.

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post #12 of 24 (permalink) Old Jul 19th, 06, 8:57 PM
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Re: Dumb: Why does my lower radiator hose keep slipping off?

Can you remove the "grommet-thingy"?

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post #13 of 24 (permalink) Old Jul 20th, 06, 3:24 PM Thread Starter
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Re: Dumb: Why does my lower radiator hose keep slipping off?

Well I was going to work on the 'velle last night... instead I was haulin' hay for my daughter's horse.

I didn't want to remove the grommet in case it, well, was a functioning grommet! In which case it should have sealed or protected something.

I'll get a picture of this tonight and I appreciate all the suggestions. .

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post #14 of 24 (permalink) Old Jul 20th, 06, 3:27 PM Thread Starter
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Re: Dumb: Why does my lower radiator hose keep slipping off?

Quote:
Originally Posted by Olle
Is it really a grommet or is it a sleeve? I have never seen any grommets on the tube, only thing I have seen is a rubber sleeve, where someone had been jury rigging it when using a hose that was too big for the tube. That tar paper you're talking about sounds like a similar contraption.
Exactly what I'm talking about, but that tar-paper sleeve fell apart. The grommet/bushing is soft rubber and up against the tank wall surrounding the fitting. Is this the same as yours AlWhite?

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post #15 of 24 (permalink) Old Jul 21st, 06, 11:16 AM Thread Starter
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Re: Dumb: Why does my lower radiator hose keep slipping off?

Here's the picture: From this you can see that whatever it is, it creates a nice slick runway for the hose to slip off. If this looks ldisposable, I'll take it off. Maybe it is just what's left of the original "adapter/sleeve".
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