Lower Radiator Hose Spring

Heating / Cooling / AC

  1. DartGTDan

    DartGTDan '71 Dart GT Fan

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    I replaced the radiator, as well as the upper and lower hoses in my '71 Dart GT, back in the spring of 2019. I also added the hood to radiator seal (from DMT) at the same time.

    For the life of me, I cannot remember if the lower radiator hose had the spring in it. If I were to grab and squeeze the hose, would I/should I be able to feel the spring inside?
     
  2. dadsbee

    dadsbee FABO Gold Member FABO Gold Member

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    Yes..
     
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    • CRUZE 418

      CRUZE 418 FABO Gold Member FABO Gold Member

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      I do not believe they make one with a spring anymore. Perhaps someone else can verify that. Yes, if it had a spring in there, you shouldn't be able to crush the hose.
       
    • Mattax

      Mattax Just the facts, ma'am FABO Gold Member

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      I've seen 'em for sale occassionally but yes its true they are generally no longer used.
      Carroll Smith mentioned this is one of his books about race car prep. Seems the hose materials and construction improved greatly from the 1960s and 70s. His books are from the 1980s if I recall correctly, so it been a while since the manufacturers have felt confident the return hose won't collapse.
       
    • 67Dart273

      67Dart273 FABO Gold Member FABO Gold Member

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      "What I'd do" is find a welder/ fabricator.........or a friendly welding store.......and buy a "stick" of stainless TIG rod, wind it around something "a bit" smaller than the hose ID ....do a small test section and see if it "springs" out a bit" ..........wind er up and stick 'er in.............
       
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      • RustyRatRod

        RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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        CJ Pony Parts has them.
         
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        • Jadaharabi

          Jadaharabi FABO Gold Member FABO Gold Member

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        • 66fyssh

          66fyssh Don't Stop Believin' FABO Gold Member

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          Yup, I bought one from them about 5 years ago.
           
        • lemondana

          lemondana BlackDart

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          I've posted this many times on these forums. The springs only function was for the factory quick vacuum fill on the assembly line. NO other reason!
           
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          • CRUZE 418

            CRUZE 418 FABO Gold Member FABO Gold Member

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            Not trying to argue, but if that is true, why were they available aftermarket? Reconditioning my '72 318 Darts engine compartment, the lower radiator hose is aftermarket and has a long spring inside. If you get a spring from CJ Pony parts as RRR mentioned, get 2, they are short.
             
            Last edited: Feb 19, 2021
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            • RustyRatRod

              RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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              Yeah, maybe "that too" but the bottom hose is on the suction side of the water pump. I've SEEN the bottom hose suck closed on more than one on a chassis dyno under load. It happens.
               
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              • 69hemibeep

                69hemibeep Well-Known Member

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                Amazon has them for 7.99 for GM products so they are longer
                 
              • lemondana

                lemondana BlackDart

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                I would imagine that certain retailers had complaints with the bottom hose collapsing and ordered their hoses with the coils installed. I work at a Goodyear plant-now Continental and back in the late 80's when I started. The hoses that had the coils installed were all sent to the car plants, the exact same hose coming down the conveyer sent to the parts stores did not have the coil.
                If I would of known that so many people think they need a coil, I would have had the spring operator run me off a couple hundred of both the small and big block hose coils. I could even had them made in brass. I do agree that it's not a bad idea to have one.
                 
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                • shanker

                  shanker Well-Known Member

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                  I make my own out of heavy gauge hot dipped galvanized wire. I don't know if it's necessary or not (I've read more than I care two on both sides of the argument), but anyone will be hard pressed to convince me that it needs to come out. Takes a few minutes to twist one up and stuff it in. Every single one of my classic vehicles has one.
                   
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                  • 340Dart

                    340Dart Obsessive Dart Disorder FABO Gold Member

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                  • DartGTDan

                    DartGTDan '71 Dart GT Fan

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                    Thanks all! I'll find one as it appears my car does not have one.
                     
                  • CRUZE 418

                    CRUZE 418 FABO Gold Member FABO Gold Member

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                    Just measured the spring that I pulled out of the old lower hose from my '72 318 , and it's about 12" long. So I would say that the sm blk hose from CJ Pony that is 12 1/2" long and 1 1/2" dia would be a good fit.
                     
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                    • Car Nut

                      Car Nut Mopar Master

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                    • TrailBeast

                      TrailBeast AKA Mopars4us on Youtube

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                      Absolutely happens, as I have had it happen on a 440HO twice.


                      There’s only one side of that argument after someone figures out the engine gets hot a higher rpms because the hose collapses.:D
                       
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                      • Daves69

                        Daves69 Well-Known Member

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                      • DartGTDan

                        DartGTDan '71 Dart GT Fan

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                        How long does it take for a collapsed hose to return to "normal" after running at highway rpms?
                         
                      • 383Scampman

                        383Scampman Well-Known Member

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                        spring should be inside
                         
                      • CRUZE 418

                        CRUZE 418 FABO Gold Member FABO Gold Member

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                        As soon as your rpm's drop I would guess.
                        High rpm's would , could cause a collapse.
                         
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                        • 1969VADart

                          1969VADart FABO Gold Member FABO Gold Member

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                          There are a number of discussions about why you don't need the spring in the forum. But the bottom line is there is no harm to installing one if you think it might prevent a hose collapse problem. I just installed the springs in my lower radiator hose a couple of weeks ago. Might be unnecessary but it is one less thing to worry about. I ordered from CJ Pony Parts (link below). I actually ordered and installed two springs because one wasn't really long enough to cover the whole length of the hose.

                          https://www.cjponyparts.com/lower-r...ss-steel-mustang-big-block-1965-1973/p/HW770/
                           
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                          • DartGTDan

                            DartGTDan '71 Dart GT Fan

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                            Just ordered the spring from cjponyparts.

                            I didn't want to get into the whole "need it" vs. "don't need it" debate, but thanks everyone for your input.
                             
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