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Throttle body bypass hose size

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Old Mar 24, 2019 | 10:01 PM
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Default Throttle body bypass hose size

i have the throttle body bypass already done but now I am changing all my hoses.I prefer buying my hoses by the foot but don't know the sizes of the hoses. Anyone have any idea what size goes from the radiator to the coolant pipe on the engine? This is for my 2001

Thank you!

Found these pics from the web while trying to research but could not find anything.


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Old Mar 24, 2019 | 10:21 PM
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I did this last year, I read the forum and someone listed a wrong size, it was too small of ID and if I would try to force it on the radiator side, I feared of breaking the nipple so I went out to get the correct size. I want to say 3/8 inch but would need to confirm it for you. I covered it with black braided nylon so it might be hard to get a reading off the hose.
1/4 inch is definitely too small



Last edited by pjdbm; Mar 24, 2019 at 10:34 PM.
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Old Mar 25, 2019 | 12:18 AM
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Nice setup.
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Old Mar 25, 2019 | 03:30 PM
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Anyone else?
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Old Mar 25, 2019 | 05:00 PM
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Have the parts laying out.
Throttle body tubes (in&out) measure 1/4 inch.
Pipe under intake manifold measures 1/4 inch.
Hose fitting at radiator is 3/8 inch.

Last edited by voda1; Mar 25, 2019 at 05:08 PM.
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Old Mar 25, 2019 | 05:41 PM
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Originally Posted by voda1
Have the parts laying out.
Throttle body tubes (in&out) measure 1/4 inch.
Pipe under intake manifold measures 1/4 inch.
Hose fitting at radiator is 3/8 inch.
So 1/4 and 3/8 hose i would need?
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Old Mar 25, 2019 | 07:15 PM
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If you use 1/4 at the radiator, you chance breaking the nipple.
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Old Mar 26, 2019 | 04:48 PM
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Something like:
Amazon Amazon
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Old Mar 26, 2019 | 11:23 PM
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I can vouch at least on my car that it is a molded hose. 1/4 inch at the TB and 3/8s or 5/16s at the radiator.

I ended up using parts of the original hose because I was disappointed in the way that 3/8s Gates hose fit the radiator. I used a piece of stainless tubing I had on hand to make formed connection with rolled ends from the TB to the radiator.


Last edited by Mr. Black; Mar 26, 2019 at 11:25 PM.
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Old Mar 28, 2019 | 10:46 PM
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Originally Posted by Mr. Black
I can vouch at least on my car that it is a molded hose. 1/4 inch at the TB and 3/8s or 5/16s at the radiator.

I ended up using parts of the original hose because I was disappointed in the way that 3/8s Gates hose fit the radiator. I used a piece of stainless tubing I had on hand to make formed connection with rolled ends from the TB to the radiator.

Well my new radiator has a different size and didnt realize it. This thread no longer applies to me but perhaps it can help someone who is searching.
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