Correct OEM Ribbed Hose - Radiator to Overflow Tank for a 70 GS

Discussion in 'Parts wanted' started by Brett Slater, Jul 12, 2018 at 9:49 AM.

  1. Brett Slater

    Brett Slater Super Moderator Staff Member

    As stated in the title.

    This is the hose that connects to the radiator and is secured to both the radiator and the lower outlet of the overflow tank - using green pinch clamps.

    See picture below and thanks in advance!

    IMG_1982.jpg
     
    OHC JOE likes this.
  2. OHC JOE

    OHC JOE BUILDIN A 1970 GSX CLONE

    I'll be following this one also.
     
  3. Doo Wop

    Doo Wop Where were you in '62?

  4. Brett Slater

    Brett Slater Super Moderator Staff Member

    This should be thick walled, like the other hose that connects to the upper outlet of the tank.

    While the size is correct, (3/8) thin walled is no bueno.

    See below: 20180531_145012.jpg
     
  5. pglade

    pglade Well-Known Member

    Looks like it might be the same hose as used on the w/shield washer pump....the "main" hose that runs from the washer bottle to the washer pump assembly. That is also "thick walled" hose IMO and will have one or more "ribs" on the hose.
     
    Brett Slater likes this.
  6. Brett Slater

    Brett Slater Super Moderator Staff Member

    It should be a 3/8 line so the green pinch clamps fit it.

    I think that washer hose might be smaller diameter.
     
  7. copperheadgs1

    copperheadgs1 copperheadgs1

    Washer hose is definitely smaller. I think it may be 1/4 ID. The hose that connects radiator to lower port on overflow jug is 3/8 ID thick wall same as a fuel line hose but original had ribs. I wish I could find the extra originals I saved. They are not where I thought I put them but you know how that works. Stay away from those eBay or restoration hoses as they are all thin walled. Buick just did not use them at all on 70-72 as they will collapse under pressure.
     
    Last edited: Jul 13, 2018 at 10:01 AM
    Brett Slater likes this.
  8. Duane

    Duane Member

    Brett,
    What are the inside and outside diameters of the 2 hoses, and let me know which is which? I also would like to know their lengths.

    Are you looking for these for your car, or are you trying to get them made?

    I have boxes of original hoses.
    Duane
     
    Weisguy184 likes this.
  9. OHC JOE

    OHC JOE BUILDIN A 1970 GSX CLONE

    I will double check also with what I removed from my car also.
    Does CARS have the correct style I think I remember there catalog saying it was the correct style I think not sure
     
  10. Brett Slater

    Brett Slater Super Moderator Staff Member

    Duane,

    The hose I'm looking for is a 3/8 line that runs from the radiator to the lower outlet of the overflow tank - which is a larger diameter outlet than the top one.

    I don't know the inside diameter or length but I do know it's shorter than the hose that will affix to the radiator tank.

    The first post has a picture of Dave's old GSX and yes, this would be for my car.

    As for the longer hose, I'll measure it when I get home.

    Thanks!
     
  11. Brett Slater

    Brett Slater Super Moderator Staff Member

    Here is the hose I already have - that affixes to the side of the radiator tank. Inside diameter is a 1/4 inch and it's exactly 24.5 inches long.

    If you have this one, you'll obviously be able to decipher which is which. This one is much longer than the 3/8 one from the radiator to the bottom outlet of the overflow.

    20180713_205050.jpg 20180713_205215.jpg
     
  12. Brett Slater

    Brett Slater Super Moderator Staff Member

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