63-67 A/C Dehydrator (drier) identification

[Bill C.]

Hi,
I know this has been discussed in previous postings but I have not seen any answer to my question . The photo#1 below shows two dehydrators, at the top at the side of the sight glass one has a boss on one side and the other does not, the only other difference between the two appears to be that the unit without the boss has more of a radius at the side/bottom edge and also the unit without the boss appears to have the sight glass recessed deeper. BTW the unit without the boss also has the evidence of a sticker on the bottom as previously described in prior posts.

Can anyone shed any light on the differences between the two and correctness/year applications? I included other pics showing the sticker evidence and one with an original plug in the sight glass ( it was in fact in the one without the boss) , also interestingly its not a red plug painted black, but rather a molded black plug, painted over again in black. It for sure had never been pulled before.

I will take some pics of that also and post them.

Thanks!

Bill Caldwell

[Bill C.]

Re: 63-67 A/C Dehydrator (drier) identification

Here are pics of the plug

[Wayne W.]

Re: 63-67 A/C Dehydrator (drier) identification

Picture of the tag.

[Jim S.]

Re: 63-67 A/C Dehydrator (drier) identification

Hi,
I know this has been discussed in previous postings but I have not seen any answer to my question . The photo#1 below shows two dehydrators, at the top at the side of the sight glass one has a boss on one side and the other does not, the only other difference between the two appears to be that the unit without the boss has more of a radius at the side/bottom edge and also the unit without the boss appears to have the sight glass recessed deeper. BTW the unit without the boss also has the evidence of a sticker on the bottom as previously described in prior posts.

Can anyone shed any light on the differences between the two and correctness/year applications? I included other pics showing the sticker evidence and one with an original plug in the sight glass ( it was in fact in the one without the boss) , also interestingly its not a red plug painted black, but rather a molded black plug, painted over again in black. It for sure had never been pulled before.

I will take some pics of that also and post them.

Thanks!

Bill Caldwell

Bill,

I can't help you identify what year the one with the side boss goes to . However the one off my 66 vette and the one I picked from a 66 Impala have no boss on them , and both had a sticker on the boittom painted over in black.

For what ever that is worth,


Jim

[Wayne M.]

Re: 63-67 A/C Dehydrator (drier) identification

Bill -- I vote that the one without the square boss is TFP for up to (incl ?) 1967. Based on small sample size [the one on my early '65 = no boss (THUMBNAIL BELOW BIG PIC); one WITH square boss given to me by a friend who said it was off a '67 truck; NOS unpainted unit from GM dealer in early '80s has square boss] The square boss driers have a letter stamped just above the "COND" stamping (big pic below).



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[William C.]

Re: 63-67 A/C Dehydrator (drier) identification

I'm with the 'no boss" contingent. Also, early compressors used a different case form later models, '65 for sure, probably '66 and nor sure about '67. Picture of early compressor attached, note the change in diameter toward the flange of the case. Later cases use a welded joint (easily seen if you look at one) in this location.

[Bill C.]

Re: 63-67 A/C Dehydrator (drier) identification

I'm with the 'no boss" contingent. Also, early compressors used a different case form later models, '65 for sure, probably '66 and nor sure about '67. Picture of early compressor attached, note the change in diameter toward the flange of the case. Later cases use a welded joint (easily seen if you look at one) in this location.

Bill,
I am aware of the different bodies, also of the different front flanges, I have been trying to determine when the changeover date was and if there was ever any "mixing" of the early body and the later front flange, or later body and early flange. As I am sure you are aware, they interchange all just fine.

I am pretty confident all of 63- 65 had early body and early front flange, pretty sure early 66 is same, but I "think" it changed sometime in 66. Been watching for years but pretty hard to find unmolested examples or any documentation.

Anyone??

[Bill C.]

Re: 63-67 A/C Dehydrator (drier) identification

Thanks to Wayne and Jim and Bill for responding earlier!

[Bill C.]

Re: 63-67 A/C Dehydrator (drier) identification

Just as a point of interest, the photo in the JM of a dehydrator on page 147 shows the one with the boss as an example.....

[Jim S.]

Re: 63-67 A/C Dehydrator (drier) identification

Darn'd if it doesn't !

Now we need a Senior Judge to step up and join in .

[William C.]

Re: 63-67 A/C Dehydrator (drier) identification

I too have been looking for info but I'm finding Harrision documentation to be a bit elusive. I just started the research, so maybe will come up with something as I progress...

[Bill C.]

Re: 63-67 A/C Dehydrator (drier) identification

I too have been looking for info but I'm finding Harrision documentation to be a bit elusive. I just started the research, so maybe will come up with something as I progress...

Sounds good Bill, keep us updated if you find anything under the rocks!
Bill Caldwell

[William C.]

Re: 63-67 A/C Dehydrator (drier) identification

Would appreciate any members from the Dayton area that might have worked there in an engineering capacity who might have info on product change sequences to drop me an email to see what we can put together.

[Bill C.]

Re: 63-67 A/C Dehydrator (drier) identification

Would appreciate any members from the Dayton area that might have worked there in an engineering capacity who might have info on product change sequences to drop me an email to see what we can put together.

If anyone does reply, possibly they can shed some light on the switch over period for the early-late case and the different design front hub? And the reasons for the changes.

[William C.]

Re: 63-67 A/C Dehydrator (drier) identification

That's what I'm hoping for. I'm pretty sure from typical GM practices that the move from swedged case to welded case was a cost savings, probably at a time when increased demand for A/C drove a need for new investment in capacity, but I don't have documentation or knowledge fro a firsthand source to back that up.