1975 L-48, 4 speed with A/C Heater hoses? - NCRS Discussion Boards

1975 L-48, 4 speed with A/C Heater hoses?

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  • Lynn S.
    Very Frequent User
    • May 5, 2016
    • 105

    1975 L-48, 4 speed with A/C Heater hoses?

    The 1975-77 NCRS technical manual and Judging guide page 77, Heater Hoses, reads ... the most common designs have 3 or 4 narrow ribs along their length that is a code to indicate the manufacturer. These ribs are narrower than those on current service replacements. A/C cars have molded bends at the heater core and intake manifold end. On Non-A/C cars without an expansion tank, ...
    Checking with several vendors who state in their description "reproduction quality or same as original" for the correct hose replacement, I am repeatedly told that '68 - '82 cars with A/C in their experience had smooth hoses due to the additional manufacturing process to mold in the bends at each end. Their experience had the ribbed hoses on Non-A/C cars '68 - '82.

    I cannot find ribbed hoses with molded ends.

    Please advise. Thanks
    Lynn Skipper 62393
    1995 LT-1 Polo Green conv. w/ Beige/Beige, Chapter Top Flight
    2018 LT-1 GS conv w/ Kalahari/Black, Heritage pkg, 2LE, 8sp w/ paddles
    1975 L-48 Steel Blue conv, w/ Med Saddle/Med Saddle, 4 spd, C-60 current project.
  • Edward J.
    Extremely Frequent Poster
    • September 15, 2008
    • 6940

    #2
    Re: 1975 L-48, 4 speed with A/C Heater hoses?

    Lynn, There does not seem to be any Corvette venders interested in making these hoses, about 10 years ago when I restored my 72 and I was looking myself for the hoses. judging the hoses it only 1 point deduct.
    New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.

    Comment

    • Tom R.
      Extremely Frequent Poster
      • June 30, 1993
      • 4099

      #3
      Re: 1975 L-48, 4 speed with A/C Heater hoses?

      Lynn

      We are in the midst of the 75-77 revision and, ironically in the cooling system section. I'm attaching a draft of the revision for heater hoses and we are in process of confirming part numbers and configuration. You'll find that A/C were molded and included, perhaps not ribs but grooves. Also, introduced in 74 is the water-shut off valve but we find conflicts with its use in 75, whether included with A/C or non A/C applications. After 75, all years included the water shut-off valve and the same hoses were used. So take a look at this. Perhaps you can help us "tweak" the details as configured in 75.

      1975-77 _heater hoses_23Oct20.pdf
      Tom Russo

      78 SA NCRS 5 Star Bowtie
      78 Pace Car L82 M21
      00 MY/TR/Conv

      Comment

      • Larry M.
        Extremely Frequent Poster
        • January 1, 1992
        • 2688

        #4
        Re: 1975 L-48, 4 speed with A/C Heater hoses?

        Closest I have found are from DR REBUILD. Assuming he opens his store back up, you should probably get these for your car.

        Larry

        Comment

        • Edward J.
          Extremely Frequent Poster
          • September 15, 2008
          • 6940

          #5
          Re: 1975 L-48, 4 speed with A/C Heater hoses?

          Larry years ago Doc had one NOS 3/4 hose, @120.00 I believe.i ended up buying the molded hoses from him. No groves or or codes stamped on them. I like some of the Doc parts, I am to waiting to place an order with him, last I heard it was going to be beginning of next year.
          New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.

          Comment

          • Lynn S.
            Very Frequent User
            • May 5, 2016
            • 105

            #6
            Re: 1975 L-48, 4 speed with A/C Heater hoses?

            Thanks Larry for your input and advice. Mine is not a Survivor car. Just one I am trying to restore as correctly as possible.
            Lynn Skipper 62393
            1995 LT-1 Polo Green conv. w/ Beige/Beige, Chapter Top Flight
            2018 LT-1 GS conv w/ Kalahari/Black, Heritage pkg, 2LE, 8sp w/ paddles
            1975 L-48 Steel Blue conv, w/ Med Saddle/Med Saddle, 4 spd, C-60 current project.

            Comment

            • Lynn S.
              Very Frequent User
              • May 5, 2016
              • 105

              #7
              Re: 1975 L-48, 4 speed with A/C Heater hoses?

              Thanks for your help and the attachment. My car was one of the proverbial basket case cars. Not a fully assembled survivor. So I'm just trying to restore it as correctly as possible. Hope to see you in Lakeland next February.
              Lynn Skipper 62393
              1995 LT-1 Polo Green conv. w/ Beige/Beige, Chapter Top Flight
              2018 LT-1 GS conv w/ Kalahari/Black, Heritage pkg, 2LE, 8sp w/ paddles
              1975 L-48 Steel Blue conv, w/ Med Saddle/Med Saddle, 4 spd, C-60 current project.

              Comment

              • Lynn S.
                Very Frequent User
                • May 5, 2016
                • 105

                #8
                Re: 1975 L-48, 4 speed with A/C Heater hoses?

                Thanks again Larry for your reply.
                Lynn Skipper 62393
                1995 LT-1 Polo Green conv. w/ Beige/Beige, Chapter Top Flight
                2018 LT-1 GS conv w/ Kalahari/Black, Heritage pkg, 2LE, 8sp w/ paddles
                1975 L-48 Steel Blue conv, w/ Med Saddle/Med Saddle, 4 spd, C-60 current project.

                Comment

                • Lynn S.
                  Very Frequent User
                  • May 5, 2016
                  • 105

                  #9
                  Re: 1975 L-48, 4 speed with A/C Heater hoses?

                  Ed, thanks for your reply. I will probably go your same route and take the hit on originality.
                  Lynn Skipper 62393
                  1995 LT-1 Polo Green conv. w/ Beige/Beige, Chapter Top Flight
                  2018 LT-1 GS conv w/ Kalahari/Black, Heritage pkg, 2LE, 8sp w/ paddles
                  1975 L-48 Steel Blue conv, w/ Med Saddle/Med Saddle, 4 spd, C-60 current project.

                  Comment

                  • Jeffrey S.
                    Extremely Frequent Poster
                    • May 31, 1988
                    • 1882

                    #10
                    Re: 1975 L-48, 4 speed with A/C Heater hoses?

                    Originally posted by Lynn Skipper (62393)
                    The 1975-77 NCRS technical manual and Judging guide page 77, Heater Hoses, reads ... the most common designs have 3 or 4 narrow ribs along their length that is a code to indicate the manufacturer. These ribs are narrower than those on current service replacements. A/C cars have molded bends at the heater core and intake manifold end. On Non-A/C cars without an expansion tank, ...
                    Checking with several vendors who state in their description "reproduction quality or same as original" for the correct hose replacement, I am repeatedly told that '68 - '82 cars with A/C in their experience had smooth hoses due to the additional manufacturing process to mold in the bends at each end. Their experience had the ribbed hoses on Non-A/C cars '68 - '82.

                    I cannot find ribbed hoses with molded ends.

                    Please advise. Thanks
                    Lynn,
                    Attached are hoses with the molded ends and grooves/ribs. I purchased these from the vendor in the second photo at Carlisle.
                    Jeff
                    Attached Files

                    Comment

                    • Edward J.
                      Extremely Frequent Poster
                      • September 15, 2008
                      • 6940

                      #11
                      New England chapter member, 63 Convert. 327/340- Chapter/Regional/national Top Flight, 72 coupe- chapter and regional Top Flight.

                      Comment

                      • Lynn S.
                        Very Frequent User
                        • May 5, 2016
                        • 105

                        #12
                        Re: 1975 L-48, 4 speed with A/C Heater hoses?

                        Thank you very much Mr Salzburg for the info on the hoses. I will be calling them Monday morning. Wish me luck.
                        Lynnf
                        Lynn Skipper 62393
                        1995 LT-1 Polo Green conv. w/ Beige/Beige, Chapter Top Flight
                        2018 LT-1 GS conv w/ Kalahari/Black, Heritage pkg, 2LE, 8sp w/ paddles
                        1975 L-48 Steel Blue conv, w/ Med Saddle/Med Saddle, 4 spd, C-60 current project.

                        Comment

                        • Jeffrey S.
                          Extremely Frequent Poster
                          • May 31, 1988
                          • 1882

                          #13
                          Re: 1975 L-48, 4 speed with A/C Heater hoses?

                          Originally posted by Edward Johnson (49497)
                          Jeff I’ve seen that vender in Carlisle, that’s the first time I have seen a hose with grooves do you remember if both hoses has the grooves or was it just the 3/4 hose? Thanks Ed, hope there still in business.
                          Both hoses had the same grooves. They also had the GM logo- lacquer thinner works great!
                          Jeff

                          Comment

                          • Jeffrey S.
                            Extremely Frequent Poster
                            • May 31, 1988
                            • 1882

                            #14
                            Re: 1975 L-48, 4 speed with A/C Heater hoses?

                            Originally posted by Lynn Skipper (62393)
                            Thank you very much Mr Salzburg for the info on the hoses. I will be calling them Monday morning. Wish me luck.
                            Lynnf
                            OK- good luck!
                            Jeff

                            Comment

                            • Joe L.
                              Beyond Control Poster
                              • February 1, 1988
                              • 43211

                              #15
                              Re: 1975 L-48, 4 speed with A/C Heater hoses?

                              All------


                              The number of ribs or grooves on the hoses was a code which denoted the hose manufacturer. I don't know that they were required if the manufacturer was otherwise identified by a code printed on the hose.
                              In Appreciation of John Hinckley

                              Comment

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