1972 Heater Hose with A/C - NCRS Discussion Boards

1972 Heater Hose with A/C

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  • Christopher K.
    Very Frequent User
    • September 10, 2007
    • 311

    1972 Heater Hose with A/C

    I'm trying to find the proper routing for the heater hoses from the fender clip to the heater core. This is for a 350 with a/c.
    For earlier C3's (through '71?) there was a hot water shut off valve and hoses are routed behind the expansion valve and POA valve and then underneath the evaporator (see pic 1 and pic 2)
    Tha AIM for 1972 has the hoses routed in front of the POA and expansion valves and then underneath the evaporator. This takes the hoses closer to the exhaust and on the inside of the front frame (see pic 3 and 4). Also note on the '72 AIM page there is a revision record at the bottom identifying a change due to a "hose rerouting".
    I'd like to get this the correct way. Perhaps an owner of a 1972 with original hoses can help?
    Thanks very much for the help,
    Attached Files
    Chris

    '72 Lt-1 a/c Pewter Silver coupe Mason Dixon Chapter Top Flight 2016
    '73 L82 4 spd Dark Metallic Blue coupe Chapter Top Flight 2023
  • Mark E.
    Extremely Frequent Poster
    • April 1, 1993
    • 4498

    #2
    Re: 1972 Heater Hose with A/C

    I don't have a '72 small block, but I can tell you:
    - Take heater hose routing shown in AIM with a grain of salt. For 1970 it shows a routing I've never seen in a real car.
    - I see what you mean about the '72 AIM diagram... the hoses are apparently between the evaporator and engine. That seems odd.
    - The Keen diagram looks smarter, but I can't tell you if it's TFP.
    - The drain flap for your evaporator is missing. That's a source for a lot of hot air into the cabin.
    Mark Edmondson
    Dallas, Texas
    Texas Chapter

    1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
    1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

    Comment

    • Christopher K.
      Very Frequent User
      • September 10, 2007
      • 311

      #3
      Re: 1972 Heater Hose with A/C

      Thanks Mark for the reply, you have a sharp eye noticing that drain flap! I actually "borrowed" these pics, they're not my car.
      I agree with you about the illustrations in the AIM. Just trying to figure out what's correct for '72.
      Chris

      '72 Lt-1 a/c Pewter Silver coupe Mason Dixon Chapter Top Flight 2016
      '73 L82 4 spd Dark Metallic Blue coupe Chapter Top Flight 2023

      Comment

      • Christopher K.
        Very Frequent User
        • September 10, 2007
        • 311

        #4
        Re: 1972 Heater Hose with A/C

        Just trying one last time to see if anyone has an opinion on this (perhaps judging experience)?
        Thanks for any guidance,
        Chris

        '72 Lt-1 a/c Pewter Silver coupe Mason Dixon Chapter Top Flight 2016
        '73 L82 4 spd Dark Metallic Blue coupe Chapter Top Flight 2023

        Comment

        • Ed D.
          Very Frequent User
          • December 1, 1990
          • 329

          #5
          Re: 1972 Heater Hose with A/C

          Originally posted by Christopher Krieger (47844)
          I'm trying to find the proper routing for the heater hoses from the fender clip to the heater core. This is for a 350 with a/c.
          For earlier C3's (through '71?) there was a hot water shut off valve and hoses are routed behind the expansion valve and POA valve and then underneath the evaporator (see pic 1 and pic 2)
          Tha AIM for 1972 has the hoses routed in front of the POA and expansion valves and then underneath the evaporator. This takes the hoses closer to the exhaust and on the inside of the front frame (see pic 3 and 4). Also note on the '72 AIM page there is a revision record at the bottom identifying a change due to a "hose rerouting".
          I'd like to get this the correct way. Perhaps an owner of a 1972 with original hoses can help?
          Thanks very much for the help,
          Chris,
          I have a 72 sb with air. The heater hoses have been replaced about 15 years ago. I replaced them myself, taking much care in routing the hoses with the original fasteners, and exact routing. The car has been judged at several Regional s and Nationals, without loosing any points for the AC or the Heater Hoses. I will try to get to the car tomorrow and take some pictures.
          Ed
          Ed DiNapoli
          CNJ Chapter Past Chairman/Co Founder

          1972 Targa Blue Coupe, Original Owner,
          Duntov Award, Sam Foltz Award,
          Founders Award, NCRS Gallery VIII
          2011 Corvette Convertible
          NCRS Presidents Award 2014

          Comment

          • Christopher K.
            Very Frequent User
            • September 10, 2007
            • 311

            #6
            Re: 1972 Heater Hose with A/C

            Thanks Ed, that would be great!
            Chris

            '72 Lt-1 a/c Pewter Silver coupe Mason Dixon Chapter Top Flight 2016
            '73 L82 4 spd Dark Metallic Blue coupe Chapter Top Flight 2023

            Comment

            • Ed D.
              Very Frequent User
              • December 1, 1990
              • 329

              #7
              Re: 1972 Heater Hose with A/C

              IMG_1822.jpgIMG_1824.jpg[QU

              Chris,
              Here are 2 photos that show the routing under the compressor, and the routing through the clip on the firewall. I was not allowed to enter more photos. I will post additional posts to enter more pictures
              Ed DiNapoli
              CNJ Chapter Past Chairman/Co Founder

              1972 Targa Blue Coupe, Original Owner,
              Duntov Award, Sam Foltz Award,
              Founders Award, NCRS Gallery VIII
              2011 Corvette Convertible
              NCRS Presidents Award 2014

              Comment

              • Ed D.
                Very Frequent User
                • December 1, 1990
                • 329

                #8
                Re: 1972 Heater Hose with A/C

                IMG_1815.jpgIMG_1814.jpgim1.shutterfly.jpg


                The fist picture shows the hoses attacted to the intake and the water pump, the second photo from under the car showing the attachment to the air handler and going to the heater core, the 3 photo is an over all view of the engine and compressor. Let me know if you need additional photos or more info.
                Ed
                Ed DiNapoli
                CNJ Chapter Past Chairman/Co Founder

                1972 Targa Blue Coupe, Original Owner,
                Duntov Award, Sam Foltz Award,
                Founders Award, NCRS Gallery VIII
                2011 Corvette Convertible
                NCRS Presidents Award 2014

                Comment

                • Mark E.
                  Extremely Frequent Poster
                  • April 1, 1993
                  • 4498

                  #9
                  Re: 1972 Heater Hose with A/C

                  Nice looking engine, Ed.

                  Is the AC evaporator box nipple missing (2nd photo, post #8)?
                  Mark Edmondson
                  Dallas, Texas
                  Texas Chapter

                  1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
                  1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

                  Comment

                  • Ed D.
                    Very Frequent User
                    • December 1, 1990
                    • 329

                    #10
                    Re: 1972 Heater Hose with A/C

                    Originally posted by Mark Edmondson (22468)
                    Nice looking engine, Ed.

                    Is the AC evaporator box nipple missing (2nd photo, post #8)?
                    Mark,
                    I dont remember a rubber nipple on the condensate opening. That is not to say there was never one there. The box has never been worked on.
                    Ed
                    Ed DiNapoli
                    CNJ Chapter Past Chairman/Co Founder

                    1972 Targa Blue Coupe, Original Owner,
                    Duntov Award, Sam Foltz Award,
                    Founders Award, NCRS Gallery VIII
                    2011 Corvette Convertible
                    NCRS Presidents Award 2014

                    Comment

                    • Christopher K.
                      Very Frequent User
                      • September 10, 2007
                      • 311

                      #11
                      Re: 1972 Heater Hose with A/C

                      Thanks VERY much Ed, those are fantastic. I know you have to be a bit of a contortionist to get that pic underneath! Picture #2 in the first and second post were just what I needed. I've looked at dozens of photos and have never been able to find shots like these. It's also difficult to determine what's correct since many may have been reinstalled incorrectly. Hopefully this will help others too. Thanks again for the extra effort.

                      Mark, can you post a picture of the evaporator box nipple you're talking about?
                      Chris

                      '72 Lt-1 a/c Pewter Silver coupe Mason Dixon Chapter Top Flight 2016
                      '73 L82 4 spd Dark Metallic Blue coupe Chapter Top Flight 2023

                      Comment

                      • Mark E.
                        Extremely Frequent Poster
                        • April 1, 1993
                        • 4498

                        #12
                        Re: 1972 Heater Hose with A/C

                        You can see the nipple at the bottom center of the photo. It keeps hot air out of the evaporator box while allowing condensate to drain. Without it, hot air from the engine compartment enters the evap box, increasing air temperature at the vent outlets.

                        For orientation, the front of the car is towards the bottom of the photo, and the rear of the RH cylinder head is lower left.

                        You can see that I still need to seal the opening around the heater core connections (which are plugged).

                        AC Evaporator Box- Bottom.jpg
                        Mark Edmondson
                        Dallas, Texas
                        Texas Chapter

                        1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
                        1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

                        Comment

                        • Mark E.
                          Extremely Frequent Poster
                          • April 1, 1993
                          • 4498

                          #13
                          Re: 1972 Heater Hose with A/C

                          Originally posted by Ed DiNapoli (18386)
                          Mark,
                          I dont remember a rubber nipple on the condensate opening. That is not to say there was never one there. The box has never been worked on.
                          Ed
                          They live a rough life and are known to rot and fall apart. But in your case, it looks like its attaching snap ring is also missing which I wouldn't think happened on its own. It's not unusual for a mechanic to remove the nipple to blow debris out the evap box, but then not replace it because it's damaged or rotten.
                          Mark Edmondson
                          Dallas, Texas
                          Texas Chapter

                          1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
                          1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

                          Comment

                          • James B.
                            Very Frequent User
                            • March 1, 1985
                            • 217

                            #14
                            Re: 1972 Heater Hose with A/C

                            Chris,

                            FYI: The nipple and clamp are available through the Corvette parts vendors. Total price is $12 ~ $14.

                            James

                            Comment

                            • Christopher K.
                              Very Frequent User
                              • September 10, 2007
                              • 311

                              #15
                              Re: 1972 Heater Hose with A/C

                              Thanks Mark for the picture!
                              Chris

                              '72 Lt-1 a/c Pewter Silver coupe Mason Dixon Chapter Top Flight 2016
                              '73 L82 4 spd Dark Metallic Blue coupe Chapter Top Flight 2023

                              Comment

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