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 1991 Caprice 5.0L A/C work‏, 1991 Caprice 5.0L A/C work‏
WyrTwister
Posted: Mar 30 2013, 07:15 AM


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Member No.: 263
Joined: 30-March 13




My late father's Caprice had been parked for 10-15 years . It is obvious from the oily dirt around the A/C compressor , that the freon ( and much of the oil ) has leaked out .

If I just vacuum it down , check for leaks , recharge with freon and oil , what are the chances the seal will be OK , once it gets wetted / lubricated with oil ?

To replace the seal , I am pretty sure I can remove the clutch parts . What tooling is need to remove the old seal and replace with a new seal ?

I am guessing I need to pour the old mineral oil out of it & install PAG oil in it and a new accumulator ? I think there are several types of PAG oil ? How do I find out which type to use ? How much ?

I have read to put 1/2 the required amount in the compresses and 1/2 in the accumulator ?

I will vacuum it down , hard , maybe over night & then let it set for a couple of hours & check for loss of vacuum .

God bless
Wyr
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Armada Master
Posted: Mar 31 2013, 02:48 AM


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What year is it?

Seal is going to be bad. Plan on R&Ring the compressor.

James arcadefreak.gif


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user posted imageuser posted image
1997 Ford Crown Victoria 4.6 V8 63k Daily Driver
1994 Chevy Caprice 9C1 4.3 V8 140k Daily Driver
1991 Chevy Caprice wagon 5.0 V8 170K Daily Driver
1993 Chevy Caprice sedan 5.0 V8 50k miles Daily Driver
1989 Chevy Cheyenne EX-CAB 5.0 V8 160K Daily Driver

Retired:
92 Chevy Caprice 9C1 5.7 V8 150k
97 Geo Metro hatchback 1.3 4cyl 70k
94 Buick Roadmaster 5.7 V8 156K
92 Chevy Caprice 9C1 5.7 V8 146K
89 Chevy Caprice 5.0 V8 173k
97 Toyota T100 2.7 4cyl 270k
93 Chevy Cavalier 2.2 4cyl 55k
88 Chevy Caprice Classic 5.0 V8 100k
89 Chevy Caprice 9C1 5.7 V8 210k
87 Dodge Ram D150 5.9 V8 70k
85 Dodge Diplomat 5.2 V8 55k
83 Chevy Impala 9C1 5.7 V8 165k
84 Olds Delta 88 5.0 V8 160k
83 Olds Delta 88 5.0 V8 200k
74 Buick Riviera 455 V8 170K

user posted image
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cletus284
Posted: Mar 31 2013, 12:03 PM


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Posts: 515
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Joined: 22-May 10



If you're going to go to the trouble of getting that A/C system working again, you had best replace all seals, the hoses, accumulator/dryer, compressor and flush the condenser and evaporator. Then you can start fresh and it won't leak.

If you want to go the cheap route, at your own risk, you can evacuate the system and recharge it with R134A and Ester oil. DO NOT use PAG oil if you don't replace and/or flush EVERY component to get rid of the old mineral oil. PAG and mineral oils are not compatible. I would also take this time to replace the Schrader valves on the high & low pressure service ports.

I did the latter procedure to my '91 K1500 pickup 7 years ago, and it's still working. It only had a leaky high side valve. The compressor is a little noisy, but still running (knock on wood). YMMV.


--------------------
2005 Pontiac GTO
1991 K1500 Silverado
1970 Pontiac GTO Convertible (Work in Progress)
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WyrTwister
Posted: Apr 1 2013, 05:23 AM


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Joined: 30-March 13



QUOTE (Armada Master @ Mar 31 2013, 02:48 AM)
What year is it?

Seal is going to be bad. Plan on R&Ring the compressor.

James arcadefreak.gif

1991 Caprice 5.0L .

The car has about 44,000 real miles on it . It has been parked for 10 - 15 years .

I can see maybe replacing the seal . Why replace the compressor . it is not worn out ?

God bless
Wyr
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WyrTwister
Posted: Apr 1 2013, 05:27 AM


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Posts: 10
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Joined: 30-March 13



QUOTE (cletus284 @ Mar 31 2013, 12:03 PM)
If you're going to go to the trouble of getting that A/C system working again, you had best replace all seals, the hoses, accumulator/dryer, compressor and flush the condenser and evaporator. Then you can start fresh and it won't leak.

If you want to go the cheap route, at your own risk, you can evacuate the system and recharge it with R134A and Ester oil. DO NOT use PAG oil if you don't replace and/or flush EVERY component to get rid of the old mineral oil. PAG and mineral oils are not compatible. I would also take this time to replace the Schrader valves on the high & low pressure service ports.

I did the latter procedure to my '91 K1500 pickup 7 years ago, and it's still working. It only had a leaky high side valve. The compressor is a little noisy, but still running (knock on wood). YMMV.

Ester oil is more compatable with mineral oil , than PAG oil ?

Are there more than one viscosity ? If so , which viscosity do I need ?

I am learning about leaky Schrader valves . Seems like a lot of refrigerant / A/C leaks are caused by them ?

Thanks ,
God bless
Wyr
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storm9c1
Posted: Apr 1 2013, 08:08 AM


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Posts: 1,074
Member No.: 118
Joined: 22-October 10



Yes, schrader valves are a big problem. The little plastic caps help prevent leaks, but often they are lost or don't seal as well as they should. If I suspect the valve is leaking, I just replace it. You must replace it if you are vacuuming down the system since you will have it out anyways and you shouldn't reinstall a used one. Most auto parts stores sell a A/C schrader valve kit that comes with a little wrench and a few spare valves.

As for the oils, these details have often confused me, especially when doing a conversion. I do know you just can't mix new PAG oil in the old system with the old style oil. Ester oil sounds about right for a conversion. I don't think there is anything special. Just go to a parts store and tell them you want Ester oil for A/C conversion.


--------------------
Tom S.
Active vehicles in my fleet:
2011 9C3: L77, 370ci, Caprice PPV, bought brand new in 2011.
1994 9C1: LT1, 160K miles, mostly stock, AIR system delete, home plate delete. Winter car.
1995 9C1: LT1, 169K miles, tons-o-mods, engine, transmission, rear, electrical, too many to list. Summer car.
1995 Impala SS: LT1, 20K miles, home plate delete, pipe intake, MMC drive shaft and Metco loop, rest is stock.
1995 Caprice Wagon: LT1, 127K miles, V92, completely stock.
1969 Chevy C30 tow truck: 383ci stroker, 4L80E, rollback car hauler (Hazzard county garage).
1972 Chrysler Newport: 400ci, 27K miles, 2-door hardtop, completely original survivor.
1969 Dodge Charger: 383ci BB, General Lee replica (GM fanatic by day, Mopar fanatic by night).
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Armada Master
Posted: Apr 2 2013, 06:56 AM


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Joined: 2-April 06



I have a thread in here about adding oil to my 1991 Caprice wagon last year when it got chatty and I could not find any r-12 friendly oil to buy. Should be in this subforum somewhere, my OEM A/C is still plugging along with 170k miles.

Personally, I'd look at R&Ring it at this point and converting to r-134a, because you can't find anything for r-12 these days anyway, not that it's legal to buy if you did. And yes it may not have any miles on it but old age is old age, Vatozone has a Four Seasons new compressor with everything and a 2 year warranty for less than $200.

Congrats on the 44k miles, my 1993 Caprice has 45k miles on it right now.

James cool.gif


--------------------
user posted imageuser posted image
1997 Ford Crown Victoria 4.6 V8 63k Daily Driver
1994 Chevy Caprice 9C1 4.3 V8 140k Daily Driver
1991 Chevy Caprice wagon 5.0 V8 170K Daily Driver
1993 Chevy Caprice sedan 5.0 V8 50k miles Daily Driver
1989 Chevy Cheyenne EX-CAB 5.0 V8 160K Daily Driver

Retired:
92 Chevy Caprice 9C1 5.7 V8 150k
97 Geo Metro hatchback 1.3 4cyl 70k
94 Buick Roadmaster 5.7 V8 156K
92 Chevy Caprice 9C1 5.7 V8 146K
89 Chevy Caprice 5.0 V8 173k
97 Toyota T100 2.7 4cyl 270k
93 Chevy Cavalier 2.2 4cyl 55k
88 Chevy Caprice Classic 5.0 V8 100k
89 Chevy Caprice 9C1 5.7 V8 210k
87 Dodge Ram D150 5.9 V8 70k
85 Dodge Diplomat 5.2 V8 55k
83 Chevy Impala 9C1 5.7 V8 165k
84 Olds Delta 88 5.0 V8 160k
83 Olds Delta 88 5.0 V8 200k
74 Buick Riviera 455 V8 170K

user posted image
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