70 GS Heater Hose Routing w/ AC

Discussion in 'The Big Chill' started by 12lives, Apr 22, 2019.

  1. 12lives

    12lives Engage! - Jean-Luc Picard

    [​IMG]
    I found this in the 70 Chassis Manual. I see many cars with the small hose run under the AC compressor bracket and other variations. What is correct? Is there a problem with the above picture that I am missing or a reason why folks don't follow it?
     
  2. Duane

    Duane Member

    If you took that out of the 70 Chassis Manual, then it would have been developed before the 70 model year even started and won't work for what you are trying to do.
    I can already see things on there that were never used on a 70 car.

    You need to look at the Assembly manuals. They show the routing/clamps/etc.
    Duane
     
  3. 12lives

    12lives Engage! - Jean-Luc Picard

    Thanks Duane - the assembly manual is very close to that - I looked when I got home today... Page 1-11 6. It is confusing - for example: it shows the 3/4 hose on the outside next to the blower motor. It's the page for the refrigerant lines but is the only plate I see that shows the heater hoses. Do you a have a pic of a "correct" routing?
     
  4. copperheadgs1

    copperheadgs1 copperheadgs1

    The small heater hose has to run on top of the AC bracket because it is attached to the heater valve that rests on top of the AC bracket with that rubber ring, The bigger 3/4 inch hose runs right next to it and there is a hose cushion and metal strap that holds hoses together. Make sure the bigger hose doesn’t come in contact the alternator as the heat will dimple the hose causing weakness. Especially if you have a super heat alternator like Jason!
     
    Last edited: May 13, 2019
  5. buick64203

    buick64203 Just plum crazy Staff Member

    As an FYI, there is a page in the assembly manual that lists the correct lengths of hoses for AC and non AC cars. That should help with the routing too
     
  6. copperheadgs1

    copperheadgs1 copperheadgs1

    That canister on the passenger wheel well is funky. Never saw that on a car for sure in 70.
     
  7. copperheadgs1

    copperheadgs1 copperheadgs1

    6C104EAC-4F10-43C9-B805-BC97D33412B6.jpeg Here is a 70 magazine picture. It gives a good idea.
     
  8. copperheadgs1

    copperheadgs1 copperheadgs1

    I seem to remember there is a mistake in 70 Assembly Manual and hoses are reversed so 71 would be correct.
     
  9. copperheadgs1

    copperheadgs1 copperheadgs1

    7202ACCB-2F19-4BB8-8988-713C47C6817F.jpeg Here is the 70 assembly manual. Note the weird routing of the big hose on top of heater valve.
     
  10. copperheadgs1

    copperheadgs1 copperheadgs1

    222C905C-E6CA-48BA-8269-39731768FCED.jpeg Now here is the clearer 71 picture. You will notice the 70 magazine picture is more like the 71 diagram. I believe this is correct even for 70. Also note the vacuum hose is routed over the top of valve and through metal strap. I found most original cars like this.
     
  11. copperheadgs1

    copperheadgs1 copperheadgs1

    49AB7AB5-D8EF-4F3C-B128-4F78AA0A0B73.jpeg
    That, short 5/8” length of hose from intake to heater valve needs to be 5.5 inches long.
     
  12. copperheadgs1

    copperheadgs1 copperheadgs1

    5B2B54A8-8380-43F1-985A-2FE3927334CD.jpeg Ok, here is the perfect picture for you.
     
  13. copperheadgs1

    copperheadgs1 copperheadgs1

    One more interesting observation. I have found both big and small inner diameter foam sleeves. The size you have dictates the hose it goes on.
     
  14. 12lives

    12lives Engage! - Jean-Luc Picard

    Excellent - thanks! I notice on mine the AC bracket is further forward so the valve does not rest on it - maybe that's because its an engine out of a Riv??? This information will help - thanks again!
     
  15. copperheadgs1

    copperheadgs1 copperheadgs1

    I believe you are correct. Riviera has some different brackets. I would hunt for correct one.
     
  16. copperheadgs1

    copperheadgs1 copperheadgs1

    70 bracket has no hole for ground wire and screw like 71-72. You can see where 70 ground attaches at front in picture.
     
  17. scubasteve455

    scubasteve455 Well-Known Member

    Good pics Who’s Black car. Stunning. My hoses are all wrong . length to long . I have to fix and make correct soon. Arghhhh. excellent Thread
     
  18. scubasteve455

    scubasteve455 Well-Known Member

    I was at a car cruise with the Buick and a Member of the forum was looking at my car . Can’t remember his name nice guy. And explained to me that the little black donut has to rest on the A/C bracket in that little smoothed out groove. Did not know . Most of you do. That’s how you get the correct length of the one heater hose.
     
  19. copperheadgs1

    copperheadgs1 copperheadgs1

    I am not sure on that but the factory spec for the short piece of hose is 5 1/2 inches. It puts it where it puts it.
     
  20. copperheadgs1

    copperheadgs1 copperheadgs1

    Here is all you need for lengths. This is the late 71 chart. The 70 to early 71 chart had some B396FBAE-D2A7-476C-9503-A2168865DBA0.jpeg slightly different lengths. Some were a bit too short and were strained. I have tried them all on both 70 and 71 cars. This chart works best for both 70 and 71. Probably 72 as well.
     

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