Thread Number: 74707  /  Tag: Other Home Products or Autos
automotive AC compressors
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Post# 985157   3/3/2018 at 21:17 by cfz2882 (Belle Fourche,SD)        

Who else likes automotive AC compressors(and other components of auto AC systems)? :)Thinking about salvaging ac parts from the Dodge Raider I am junking and using them to build the AC unit for my backyard observatory:Raider system has a Nippondenso compressor and microchannel evap and condenser.Thinking about subbing the ND compressor with an Airtemp v-twin(used~1960s-78 Chrysler products)or York twin just for coolness purposes :)Good 'ol GM A-6 also considered along with Sanden 508.The ND I think is axial with 3 double ended pistons.Don't know about recent model OEM factory AC compressors,But brushless DC 12v hermetic compressors have recently became avalible in aftermarket automotive AC systems-they look just like the BLDC units in "mini split"home AC units.

Post# 985158 , Reply# 1   3/3/2018 at 21:19 by washman (Butler, PA)        
I love compresors

washman's profile picture

especially the Mopar RV-2, perhaps the finest design ever to keep an automobile cool.


The A6 Delco was pretty decent except for the front seal that was prone to leakage. At any rate, it was a much better unit than the lousy R4 that superseded it.

Post# 985162 , Reply# 2   3/3/2018 at 21:31 by cfz2882 (Belle Fourche,SD)        

I have quite a few R4s in my spares stash,but I don't really care for them-noisy,Large O-rings leak when they get old,and they generate aluminum debris internally that gets between the shaft seal faces causing a leak...made 1976-95,my 82 z28 has one...I don't have a Mopar v-twin on hand,but hoping I might find one far back on a shelf at one of my fave junkyards...They look cool :)

Post# 985165 , Reply# 3   3/3/2018 at 22:17 by norgeway (mocksville n c )        
The Yorks

That Ford used were good, but the 2 cylinder Airtemps were the very best I thought.

Post# 985173 , Reply# 4   3/3/2018 at 23:10 by CorvairGeek (Gem State)        
GM Seal Retrofit

The leaky GM front seals (both ceramic '62 to mid '84, & single lip mid '84+) can be successfully remedied with a double lip seal, AC-Delco 15-30948 (GM part number 2724954). GM doesn't officially recommend it to replace the ceramic, but it works fantastic (the 'bird cage' is removed along with the ceramic seal). Fits all A6, R4 and V5, plus any others with the same diameter shaft. There is an odd ball, a DA6 or HR6 that had a different size shaft.
As bad as R4s were new, the replacements now are even more questionable. GM / Delphi quit production years ago, so all are aftermarket, no matter what name is on them. I found a good used Delphi service compressor (probably right at the end of production) for my '84 (I bought the car new, had to swap from the serpentine clutch to a light weight vee clutch to fit my car). I had put a new double lip seal in the old compressor years ago, but the big body o-ring finally gave out. I don't have any faith in replacing those. I think the body shell actually expands with age and time.

Post# 985209 , Reply# 5   3/4/2018 at 08:20 by vacerator (Macomb, Michigan)        
Those York,

and Airtemp V compressors were heavy, and old cars still had cold A/C when the car got old.
Not like today, wether the compressor fails or not, usually after 7 years, or high mileage, the A/C quits working by a leak elsewhere or and electrical fault.
To me, on an old car, it's expensive to repair so not worth it. The again, in this climate, we only really need it a few months out of the year anyway.
My dad did not have A/C on a vehicle until the early 80's. We called him cheap.
He cusotmized a '76 van and made us go camping in it. No opening back or side windows. Only a power roof vent fan. We called it the coffin.

Post# 985214 , Reply# 6   3/4/2018 at 08:42 by panthera (Rocky Mountains)        
As best I can tell

panthera's profile picture

Automotive AC compressors are subject to an enormously wider range of quality control than would be tolerated inn any other part in the car.

Our Cadillac has had at least three, our S10 is on its fourth and our late '90s Buick with 150K and the A/C never turned off by the previous owner, not ever is still a frigid ice-box in June-July-August with the original compressor and not even a recharge, not one.



Post# 985231 , Reply# 7   3/4/2018 at 09:27 by firedome (Binghamton NY & Lake Champlain VT)        
I concur...

firedome's profile picture
Mopar/Airtemp V-2 compressors were the most effective and durable ever made, we have on on a 1959 DeSoto, nearly 60 years old, and it's almost identical to the one one our recently sold 1979 Newport.

Post# 985232 , Reply# 8   3/4/2018 at 09:31 by cfz2882 (Belle Fourche,SD)        

thanks for that seal info,CorvairGeek :).I think part of the reason some AC systems lose their charge is too many o-ring fittings that leak when aged O-rings shrink in cold weather and seep...I know this has been going on with the Raider and my '03 LandRover,because oil residue can be seen at the fittings...One of the more effective ACs I can remember was a ~1971 mercury station wagon-strong streams of very cold air out the vents on that one,i remember each vent would spin a pinwheel briskly!Most effective AC in my vehicle fleet is in the '77 blazer:A-6,large blower,and the variable expansion valve setup instead of the cycling switch method used later-1978 up I think.'82 z28 system is R4,cycling switch,and though same blower as the Blazer,a little less airflow out the vents.

Post# 985250 , Reply# 9   3/4/2018 at 13:34 by dartman (Portland Oregon)        
Bad compressor in my Neon

The air in my Neon died a year after I refilled the low side with one of the slightly better kits that had a real gauge. The seals finally blew out and smelt bad and air stopped working completely shortly after. At least I got the refill kits dirt cheap and it gave me a extra year. I wonder if there are any upgrade compressors that would fit it as the Neons were pretty good cars very much hampered by cost cutting measures the Germans put on all the cars Chrysler was trying to build. They are the ones that decided to use a crap head gasket to save a few bucks per car, and I believe they also made them put a much smaller air conditioning system in then they normally would to save even more money.
It's not super critical but I sure miss my nice cool ride home during summer, and the quick clearing of foggy windows during the winter. At least the heat still works very well.
SO if anyone has any suggestions I'll look into it. Probably eventually I'll yard another compressor that looks good and get it tested and everything cleaned out so it works again.

Post# 985288 , Reply# 10   3/4/2018 at 19:07 by cfz2882 (Belle Fourche,SD)        

Looks like Neons us a Nippondenso compressor-those normally seem to be good,4 of my vehicles use ND and no problems.Could be yours was damaged by high head pressure from the fan not coming on?I'd just grab a JY compressor and see what happens with that one :)

Post# 985326 , Reply# 11   3/4/2018 at 22:46 by dartman (Portland Oregon)        

The fan has always worked like it should right to the point the freon all leaked out. Was nice to drive a car that had actual cloth still covering the seats, air conditioning, and 19mpg in town vs about 11. I think the refill might have finally blown the seals out and was figuring the same thing. Get a yard one and take my chances as they made the same body till 99 and didn't change much of anything. The 95 has some unique features like a slightly hotter cam, a different metal valve cover and pcv system that uses a oil separate box, and the gas tank and fuel pump is different. Of course you can swap over the newer parts if you want. There are tons of them in the yards for parts and they still have a loyal following as they handle really well for what they are.

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