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HVAC duct hose-78 280Z


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The 40 year old duct hoses are pretty deteriorated.  Best suggestions for replacements?  I am finding some 2" duct hose from DORMAN #96034 which looks more like the duct hose for the heat exchange from exhaust manifolds from older vehicles.  Helpful suggestions always welcome.  The resurrection project is slowly marching on.  I will have a little more spare time the next few months now that school is over and my babysitting duties are done until the middle of August when our daughter returns to her teaching job.  Thanks again, John-Lugoff, SC

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One Way, I'm not sure if it's the same for the '78Z, but my '75Z has two sizes of hoses, 2" and 1.5" (approx.).  For the 2" hoses, I used the Dorman 96002 Blower Fan Hose.  For the 1.5" hose, which goes to the footwell vents, I used the Dayco 80165 Autoflex Defroster Duct Hose.  I hope this helps!

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Thank you so much!  It is always great to get part numbers with the suggestions.  My 78 also has a smaller diameter hose that was barely there when disassembled and I think it was 1.25.  I am going out to the garage right now and  see if I can quickly locate the duct and measure it accurately.  I know the part is in the box with the other disassembled pieces.  Thanks again for the great help, John-Lugoff, SC

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Thanks again!  This diagram looks a bit different than my memory, but then again my memory is not always accurate.  It would be reference #4 or #10.  Not sure if your 1975 is identical to my 1978 but many of the illustrated parts look very similar.  Is that the factory parts illustration you have?  I was using CARPARTSMANUAL, especially when I was working on our 1968 2000 roadster for parts illustrations and numbers but on my last check on that website it came up with some CRITICAL ERROR ALERT and was not able to access the website which also had the Z cars, 510, and some other Datsun vintage vehicles.  I am quite a computer dummy when it comes to navigating, downloading, etc.  I guess I am a dinosaur and still prefer a paper copy in hand.  Thanks again, John.  I will be researching and tracking down those part # you provided if time permits today.

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Perhaps my storage bin(s) full of dash ducting hose might finally find a purpose in life.  Let me know if you can't find suitable replacements,

BTW, vintage air has some pretty nice duct hose you buy. I know they have 2" at least.

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Thanks for the great replies.  Did a bit of parts research and have come up with some GATES # at a much better price than the Dorman or Dayco.  Gates #23832 is the 2".  Gates # 23820 is the 1-1/4".  I should have those by this Friday and will keep everybody posted about the GATES duct hoses.  The pictures and descriptions do not give any details except the I.D. and the 6 ft length they come in.  About 1/3 the price of the other suppliers.  DAYCO does list the #80165 as 1-1/4 I.D.  Thanks again, John-Lugoff, SC.

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The GATES # are correct.  They are quite a rare commodity.  Both boxes are actually labeled-MADE IN THE USA.  Hopefully that includes the contents, not just the box.  Being in the retail auto parts business, it is quite discouraging to see how few parts are actually made in the USA.  GATES #23832 is the 2" ID.  GATES #23820 is the 1-1/4" ID.  Both come in 6 ft lengths.  Both are listed in our company's catalog system under defrost hose.  Thanks again for the responses.  I am doing my best to keep the resurrection process going on the 78Z, John-Lugoff, SC.

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  • 9 months later...

You won't find those on an early, but my 260Z has those outlets. (had. I have them but they're not currently installed) and my son's '76 280Z has them. Both are factory A/C cars. I don't think those are installed on Bob's '75 280Z museum car. It doesn't have factory A/C. 

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On 6/18/2019 at 9:55 PM, One Way said:

Thanks for the great replies.  Did a bit of parts research and have come up with some GATES # at a much better price than the Dorman or Dayco.  Gates #23832 is the 2".  Gates # 23820 is the 1-1/4".  I should have those by this Friday and will keep everybody posted about the GATES duct hoses.  The pictures and descriptions do not give any details except the I.D. and the 6 ft length they come in.  About 1/3 the price of the other suppliers.  DAYCO does list the #80165 as 1-1/4 I.D.  Thanks again, John-Lugoff, SC.

I used the same Gates hose as you did, which I purchased at O'Reilly.  They were the only store willing to order this.  It came in a 6 foot length, which was perfect.  My car also had the plastic elbows with the small outlet on the bottom.  They had a roll of rotted foam where they were connected to the diverter box, and the small outlets were covered with a rubber cap that looked factory.  Since these elbows didn't seem necessary, I connected the flex hose directly to the diverter box without using them.  It does seem curious to me why they would manufacture and install these parts with no function.

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Thanks for the good word about my employer, O'Reilly Auto Parts.  Our "NEVER SAY NO" attitude is promoted quite heavily by corporate management and we do our best at the front lines of the local O'Reilly parts counter to help out with those kind of strange parts needs that do not simply pop up on the parts catalog screen.  Having a part # to work with is a HUGE help for both the rookie counter team member as well as for the more experienced counter team member who most likely will not have adequate time to research in finding the part# and be able to source it for the customer.  I am the assistant manager at our local O'Reilly Auto Parts store and really enjoy helping people out with their not the usual run of the mill parts needs-brakes, spark plugs, filters, etc.-and really appreciate the customers who have done some homework on their own before coming in. The not so common parts are usually available through O'Reilly but sometimes the part # is the most difficult to find.  Thanks again-John-Lugoff, SC.

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John, I had no idea you worked for O'Reilly.  All the other stores (the usual suspects) I called on this hose just said "We don't sell that", or "What is that?".  The lady that answered the phone at O'Reilly said "I'll order that for you and it will be here tomorrow.  And, you don't have to buy it if it's not what you want".  So, I was very happy with the parts and service I received.

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On 4/4/2020 at 12:20 PM, captahole said:

What is part #3? I seem to be missing that

I found part 3 on eBay. Installed it on the car. I used 1 1/2 tube to connect it to the splitter. Its a air vent and its pretty cool little design. A 1 1/4 would probably bet a better fit if you don't want to use hose clamps.

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