Radiator Overflow Hose Correct Size

[RR Fan Dan]

What size are these hoses? The large opening is supposed to accept the hose from the radiator. The smaller opening is supposed to be overflow. I have noticed that on my car it is reversed because the hose from the radiator is too large (5/16) to go inside the split opening and down into the bottle. Is the hose the wrong size? Should it be 3/8? Or is there a special slim wall 5/16 hose that is supposed to fit, or is the nipple at my radiator not the correct size? I need for the hose from the radiator to go down inside the bottle for this to work correctly. Right now it is just decoration. I want to order the right size hose online so I need help for the correct fit.

 

[RR Fan Dan]

So nobody knows? I know it seems like a stupid question, but those are the easiest to answer.

 

[MWbirdLOVER70]

View attachment 1730358
What size are these hoses? The large opening is supposed to accept the hose from the radiator. The smaller opening is supposed to be overflow. I have noticed that on my car it is reversed because the hose from the radiator is too large (5/16) to go inside the split opening and down into the bottle. Is the hose the wrong size? Should it be 3/8? Or is there a special slim wall 5/16 hose that is supposed to fit, or is the nipple at my radiator not the correct size? I need for the hose from the radiator to go down inside the bottle for this to work correctly. Right now it is just decoration. I want to order the right size hose online so I need help for the correct fit.

Try some lube to slide on

 

[RR Fan Dan]

Try some lube to slide on

The hose that fits the radiator nipple does not fit inside the cap. It is a 5/16 hose that fits the radiator nipple but is too large a diameter to go inside the cap. Is there a different size/type of hose that will fit the radiator and go inside the bottle slipped through the opening in the cap?

 

[Bird 426]

None of my 3 cars has an overflow.

 

[MWbirdLOVER70]

The hose that fits the radiator nipple does not fit inside the cap. It is a 5/16 hose that fits the radiator nipple but is too large a diameter to go inside the cap. Is there a different size/type of hose that will fit the radiator and go inside the bottle slipped through the opening in the cap?

Try posting some pics and maybe a visual will give us more insight

 

[RR Fan Dan]

Try posting some pics and maybe a visual will give us more insight

It’s the hose from the radiator to the bottle. What size is it?

 

[MWbirdLOVER70]

Think mines 1/4 id and 5/16 od but would have to go out and check

 

[440 4 speed]

It’s the hose from the radiator to the bottle. What size is it?

Is the rad nipple to either nipple on the cap the same O.D.? If so can you go and get a hose that will fit the other nipple?
Someone should be able to post a good picture of an original cap.
What number is your rad? It doesn’t appear that there’s a hole in the cap to put a hose through it. Is there another nipple on the underside of the cap?
Maybe try using Google.

 

[RR Fan Dan]

Is the rad nipple to either nipple on the cap the same O.D.

There is no nipple on the cap? It fits through the cap. See the left de of the cap. The hose from he radiator goes through that opening and down into the overflow bottle. The hose currently on the radiator is 5/16 which is to large a diameter to go through the hole. On my car it was hooked up backwards. The 5/16 radiator hose was pushed onto the nipple on he right which is for the overflow hose if the bottle gets full. The hose from the radiator needs to fit the radiator nipple and be small enough to fit through that hole in the cap which roughly measures 1/2 inch ID. So I need a hose that is 1/2 inch OD that would fit the radiator nipple which is 5/16. The current hose 5/16 hose is larger than 1/2 OD and does not fit.

 

[RR Fan Dan]

Think mines 1/4 id and 5/16 od

1/4 ID might be too small. 5/16 is very tight on my radiator nipple. I might have the wrong radiator. In these pictures it’s hooked up backwards. It needs to be reversed.
The hose from the radiator needs to fit the radiator nipple and be small enough to fit through that hole in the cap which roughly measures 1/2 inch ID. So I need a hose that is 1/2 inch OD that would fit the radiator nipple which is 5/16. The current hose 5/16 hose is larger than 1/2 OD and does not fit.

 

[coloradodave]

You have the wrong type of hose. Go to your local parts store or online and ask for thin wall 5/16" overflow hose.
Prestone 30in x 5/16in Radiator Tubing

 

[MWbirdLOVER70]

There is no nipple on the cap? It fits through the cap. See the left de of the cap. The hose from he radiator goes through that opening and down into the overflow bottle. The hose currently on the radiator is 5/16 which is to large a diameter to go through the hole. On my car it was hooked up backwards. The 5/16 radiator hose was pushed onto the nipple on he right which is for the overflow hose if the bottle gets full. The hose from the radiator needs to fit the radiator nipple and be small enough to fit through that hole in the cap which roughly measures 1/2 inch ID. So I need a hose that is 1/2 inch OD that would fit the radiator nipple which is 5/16. The current hose 5/16 hose is larger than 1/2 OD and does not fit.View attachment 1730735View attachment 1730735

There is no nipple on the cap? It fits through the cap. See the left de of the cap. The hose from he radiator goes through that opening and down into the overflow bottle. The hose currently on the radiator is 5/16 which is to large a diameter to go through the hole. On my car it was hooked up backwards. The 5/16 radiator hose was pushed onto the nipple on he right which is for the overflow hose if the bottle gets full. The hose from the radiator needs to fit the radiator nipple and be small enough to fit through that hole in the cap which roughly measures 1/2 inch ID. So I need a hose that is 1/2 inch OD that would fit the radiator nipple which is 5/16. The current hose 5/16 hose is larger than 1/2 OD and does not fit.View attachment 1730735View attachment 1730735

Left nipple cracked and should be fixed or fluid will leak.

 

[MWbirdLOVER70]

There is no nipple on the cap? It fits through the cap. See the left de of the cap. The hose from he radiator goes through that opening and down into the overflow bottle. The hose currently on the radiator is 5/16 which is to large a diameter to go through the hole. On my car it was hooked up backwards. The 5/16 radiator hose was pushed onto the nipple on he right which is for the overflow hose if the bottle gets full. The hose from the radiator needs to fit the radiator nipple and be small enough to fit through that hole in the cap which roughly measures 1/2 inch ID. So I need a hose that is 1/2 inch OD that would fit the radiator nipple which is 5/16. The current hose 5/16 hose is larger than 1/2 OD and does not fit.View attachment 1730735View attachment 1730735

Maybe reverse your house connections so smaller goes to radiator and larger dumps out if to full

 

[MWbirdLOVER70]

There is no nipple on the cap? It fits through the cap. See the left de of the cap. The hose from he radiator goes through that opening and down into the overflow bottle. The hose currently on the radiator is 5/16 which is to large a diameter to go through the hole. On my car it was hooked up backwards. The 5/16 radiator hose was pushed onto the nipple on he right which is for the overflow hose if the bottle gets full. The hose from the radiator needs to fit the radiator nipple and be small enough to fit through that hole in the cap which roughly measures 1/2 inch ID. So I need a hose that is 1/2 inch OD that would fit the radiator nipple which is 5/16. The current hose 5/16 hose is larger than 1/2 OD and does not fit.View attachment 1730735View attachment 1730735

Call Stephen’s and see if he has a used cap and hose combo or try Google to find a yard that has Mopar used parts

 

[coloradodave]

Gave you a link in post #12 for the hose.

 

[RR Fan Dan]

Maybe reverse your house connections so smaller goes to radiator and larger dumps out if to full

Call Stephen’s and see if he has a used cap and hose combo o

Tried that smaller hose ID too small to fit radiator. The cap in the first pics are old cap. I have a new cap. I got the hose you recommended on order.

 

[RR Fan Dan]

Left nipple cracked and should be fixed or fluid will leak.

It’s supposed to be split like that

 

[MWbirdLOVER70]

It’s supposed to be split like that

No

 

[RR Fan Dan]

No

Are we talking about the same thing? I’m referring to the slits in the tab on the left that the hose passes through.