Picture of stock heater hose routing for 70 Skylark please!

Discussion in 'The Big Chill' started by derek244, Jul 8, 2022.

  1. derek244

    derek244 Gold Level Contributor

    Does anybody out there have a good picture of the stock heater hose routing for a 1970 Skylark with A/C? I cannot find anything good enough to go off of. I failed to take pictures before I tore everything apart a month ago. And I threw away the old hoses :(
     
  2. Brett Slater

    Brett Slater Super Moderator Staff Member

    This is all I could find in the service manual.

    20220709_070628.jpg
     
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  3. derek244

    derek244 Gold Level Contributor

    It's something to go by. Thank you.
     
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  4. rkammer

    rkammer Gold Level Contributor

    Here's a actual engine bay for my '70 GS455 showing correct hose routing.
    Early Engine Bay-4.jpg
     
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  5. derek244

    derek244 Gold Level Contributor

    Thank you! And that is a beautiful GS.
     
  6. Brett Slater

    Brett Slater Super Moderator Staff Member

    I moved this to the heating/cooling forum. Seems more appropriate.
     
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  7. rkammer

    rkammer Gold Level Contributor

    Thank you. I'm proud of her.
    Pics at Lake Dora (2).jpg
     
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  8. rkammer

    rkammer Gold Level Contributor

    Perhaps I should mention that my very early '70 built in Sept. '69 has the discharge muffler located differently than what is shown in the service manual. My muffler location is underneath the compressor and is secured to the wheelhouse by a "C" shaped clamp which is correct for 1971 and '72. So, my muffler location is actually incorrect for my 1970. Learned something today.

    However, the heater lines coming off the intake and timing cover are accurate either way. They pass over the A/C compressor upper bracket.
     
    Last edited: Jul 9, 2022
  9. Duane

    Duane Member

    I think the AC lines changed during either the 70 or 71 model year, so the type of hoses would depend on when the car was built.

    Don’t be so quick with thinking your hoses are wrong.
    Duane
     
  10. rkammer

    rkammer Gold Level Contributor

    Thanks for weighing in, Duane. Since my ‘70 is such an early one (9/69) I felt it was more likely to be similar to the ‘69 than the 70/71. I don’t have a ‘69 chassis manual though. Can anyone support my logic?
     
  11. Duane

    Duane Member

    The picture posted above is not correct for a 70 A-body. It might be from a big car, not sure.

    Anyway what you need to look at are the assembly manuals, not the chassis service manuals. The Chassis manuals were created before the model years started production, and many of them show pictures of cars/parts from the previous years cars.

    For an early 70 car, you need to look at the early 70 assembly manual, not the later one.

    That one will list the “first jobs”, as they called them. You would need to find the page that shows the hoses, then look at the revision dates at the top right, and go back to the time when your car was built.

    That will let you know what they were doing at that time.

    Sometimes it takes time to research the correct answers on our cars. This might be one of those times.
    Duane
     
  12. derek244

    derek244 Gold Level Contributor

    I need a assembly manual at some point. I have the service and body manual, but as time goes by I realize that I am still missing information.
     
    Last edited: Jul 9, 2022
  13. rkammer

    rkammer Gold Level Contributor

    Brett’s pic is definitely from the ‘70 chassis manual for Skyline/GS. But, if the muffler was located like the pic shows, it would leave no room for the battery as in the 70-72 A bodies. Was the battery in a different location in the 68-69 cars?
     
  14. Duane

    Duane Member

    I can appreciate what you guys are doing, but that is not how the hoses were routed on a 1970 350 or 455 motor in a Buick A-body. (ie Skylark/GS)

    This also reinforces why you should never use pictures out of a Chassis Service Manual as reference material. First off you have no idea when (during the production run) the images were generated, and two, as I said earlier, the images are often taken from cars built in the previous model year.

    Beyond the above statements, Ray is also correct, there is no way that muffler could be there on a 68-thru-72 Buick A-body as that is where the Battery goes.

    Which brings up a third point to this picture, It was labeled wrong in the book.

    I have dug through my early 1970 Assembly manual, and located the 2 drawings that reference these parts. That manual is way incomplete, and hard to read, but I was able to verify, by going through the revision notes at the top right of the pages, that the drawing does reflect how those parts were installed during the time in question.



    Chassis Service Manuals were developed to help Owners/Shops repair the cars.

    Assembly manuals were developed to help the workers on the lines build the cars. As things changed, new drawings/sheets were developed. The old sheets were removed, the new sheets were added, and the process continued. The Assembly manual "evolved" throughout the production run, and kept doing that until the model year ended, and they started on the next model year's manual.

    What you guys are trying to do is make the Chassis Service Manual do something it was never designed to do. This will only lead to trouble for your restorations, and in this instance, will actually have you looking for parts that never existed on these cars.

    Later today I will post the 2 pages from the early 70 assembly manual. That will put this issue to bed.
    Duane

    PS,
    For 1970 there are two versions of the assembly manual out there, an early version, and basically an end of production version. We do not have any examples (that I know of) from the middle of the production run.

    Therefore if your car is an early car, you should use the early incomplete book as reference.

    For later built cars you should use the complete (late book) as reference, but you need to back track the revisions on the pages to the time period when your car was built. This can become tedious if not impossible at times.

    You can also use the complete later book to reference the early built cars, but then again you need to go back through the revisions to your time period.
     
    Last edited: Jul 10, 2022
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  15. FLGS400

    FLGS400 Gold Level Contributor

    I don't know if this helps or not. However, my 69 GS400 has AC and the muffler is in the same spot that those diagrams from the 70 manual show. The diagram just has it looking grossly over-sized. It is right next to the battery.
     

    Attached Files:

  16. Duane

    Duane Member

    OK,
    After looking at the 69 Assembly Manual, it shows the same picture as posted above from the 70 Chassis Service Manual.

    This proves they often used previous model year drawings as illustrations. This makes sense as the Chassis books were developed and published for the start of the production year.


    I also checked thru the Drawings in the early 70 Assembly manual, and even though it is very hard to read, the revision block states the hoses & routing was changed on what looks like 5/3/69 or 6/3/69. (I can't tell the date closer then that)

    The next revision date is 7/21/69, therefore we know for a fact that the changes took place before 7/21/69.

    Again I will post the 2 drawings later today.
    Duane
     
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  17. Duane

    Duane Member

    Here are the pages.
    Duane


    70AM-P1-11.5.jpg 70AM-P1-11.6.jpg
     
  18. rkammer

    rkammer Gold Level Contributor

    We’ll then, that makes my ‘70 produced in Sept. 69 with the muffler hidden beneath the compressor a correct configuration. I just found the same page in my assembly manual the Duane referenced. Should have looked there first. Thanks Duane, once again for Reminding us that the assembly manual rules.
     
  19. Duane

    Duane Member

    The hoses on the cars are date coded, so you can always look at them to see if they are original.
    Duane
     
  20. George D.

    George D. Platinum Level Contributor

    Ray- My November 69 70 GS is the same configuration as yours- the muffler "clips" into a bracket that is bolted to the inner fender. The page that Duane has posted (multiple times) is what should be followed. I looked at my assembly manual and it shows the LATER version.. However, the ones that Duane posted are the correct diagrams for the early built cars..
     

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