1969 compressor

[D S.]

The numbers/letters on the rear are:
A-2
6555392
L-20

If it is a '69 shouldn't one of the numbers be a 9?

Thanks,
Scott Sims
Texas Chapter

[Domenic T.]

Re: 1969 compressor

Scott,
I would think so, maybe like A 2 9, Jan 2 1969.
I have a 69 compressor in the shop and I will take a look and get back to you.
I am not there now but will be there tonite.

DOM

[Domenic T.]

Re: 1969 compressor

Scott,
I think your casting # should end 302 not 392.
I tried to put a few mor pic's up but computer or me is messeing up so I will try
another post. This back plate has a good (Mo day year) on the back along with a casting # that you can read that ends with 302.

This ( B 03 3) is a Feb 03 1963 plate.

DOM
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[Dale C.]

Re: 1969 compressor

Domenic, Hi, and how do you get your text to move down a line? I've noticed a lot of people can't indent any more. Anyway, I don't recall where I saw it but I think that where the casting numbers are off set to the right and not centered under the notch of the muffler mounting, or that bolt hole it's a later version. Like that one is a 73 model and centered would be a 63. You certainly have seen more compressor than I have and maybe can set me straight on the date thing. Dale

[Domenic T.]

Re: 1969 compressor

Dale,
Well now you have me thinking about the 1973 vs 1963 on the back plate.
I usually believe the owners of the compressors as to what year they are.
I tried to post more pictures but things got worse and I lost my posts.
The difference on the back plates came with the clutch cut out switch that was the 3rd hole on a compressor backplate.
I think 1972 might be the 1st year the 3rd hole (thermal switch) was on the back plate.
I just put another pic up and ZAP it left this post, time to get the son here and up date ME on how to do this.
I think that someone like Joe L can answer that thermal switch better than I was trying to do, as to the 1st year it came out.
What can be said about gut pac parts was that they had metal rings 1963 to 1975.
I have found the teflon rings in older compressors in some cases because the rebuilders used gut pacs from whatever they had in used stock.
I have lots of good pics and would certainly like to help sort things out on these compressors with you guys as it is a education on year data.
One more thing that I see is the dished pistons in vette compressors along with the larger pulleys.
Going to the shop (this late) so if I can help in any way just let me know.

DOM

[D S.]

Re: 1969 compressor

Thanks. So far I can't even read the one on my '70 using a flashlight and mirror. Getting a clear photograph is tougher. Those "date codes" on A6 compressors have always been confusing to me. Should I even care?

[Dale C.]

Re: 1969 compressor

Scott, I wouldn't think it matters as much as how it works. Mine works like blowing threw straw over an ice cube. Dale

[D S.]

Re: 1969 compressor

You're lucky. Mine doesn't blow anything but air. I have a new liquid line and restored accumulator to be installed after cleaning the POA valve screen. My mechanic will do all this and pull a vacuum. I have plenty of R-12, too. He loaded R-12 in it a few years ago and he got cold sweaty lines to the accumulator but that's where it stopped. He thinks the old desiccant has clogged it.

[Jim T.]

Re: 1969 compressor

D Scott having a 1970 and having work experience on the factory air system on my 1970 I may have had the same problem you have. The POA valve you mention is on my 1970 but it does not have a filter screen. The filter screen is located in the inlet fitting of the "expansion valve". Nice picture in the 1970 Chassis Service Manual on page 1A-29 of the expansion valve and its screen. The POA valve is pictured on the same page. The expansion valve's small pointed fine screen traps the desiccant particles from the receiver-dehydrator if their containment in receiver-dehydrator is lost. The accumulator is named on later model car air conditioning systems and both the receiver-dehydrator and accumulator serve the same purpose in containing desiccant to trap moisture in the air conditioning system.
I repaired my 1970 air conditioning system because the desiccant escaped from my receiver-dehydrator and stopped the flow of R12 through the expansion valve's filter screen. The 1970 Chassis Service Manual page 1A-29 identified my problem as a restricted filter screen. I replaced my receiver-dehydrator and replaced the filter screen with a new one in the expansion valve. The original filter screen can be cleaned.
If the receiver-dehydrator is replaced the 1970 Chassis Service Manual says to add 1 oz. of clean refrigeration oil. The condensor from the connection to the receiver-dehydrator and the line to the expansion valve will need a flushing to remove possible desiccant contamination that did not reach the expansion valve's filter screen.

[Domenic T.]

Re: 1969 compressor

DSC00840.jpgDale,
Here is a 1965 with the #s offset to the right? I don't think it's a 1975 as I finished a 1974 compressor that had the 3rd hole (clutch cut out switch).
Maybe it's off another make car as I buy these off the car for parts.

Ok, did it again and lost another date code K 9 5 with the code under the bolt hole. note that the A 6 9 pictured does not have the code centered.

DOM
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