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I have a question about the AC system of the 1971 442.
I see that there are two bottles in the installation, one is the accumulator, the one that is in the front of the car, behind the grille, it also has another one next to the AC compressor, is this last one interchangeable?
Lastly, how many grams of coolant should be injected into the circuit? I don't see any sticker telling me.
Thank you.
The one behind the grille is a receiver-drier. It contains desiccant and its purpose is to remove any moisture from the system. There's also a sight glass in it that can be used as a rough guess as to whether the system is low on refrigerant. It should be replaced any time the system has been opened for more than a couple of minutes.
The one near the compressor is a muffler. Its purpose is to quiet down compressor pulsations in the system. Not 100% necessary, just one of those nice things GM added to their cars to reduce noise and head off customer complaints.
The system's refrigerant quantity is measured in pounds so you'll have to convert that quantity to metric measurement. These cars usually take between 3 and 4 pounds of refrigerant if they're still on R12 refrigerant. If it's been converted to R134A, use about 75% of the recommended quantity of R12, i.e. if system calls for 4 lb R12, install 3 lbs of R134A.
The refrigerant quantity can be found in the factory Oldsmobile Chassis Service Manual or someone here will know the exact quantity for the 1971 A-body cars.
Last edited by rocketraider; Jul 12, 2023 at 03:59 PM.
The one behind the grille is a receiver-drier. It contains desiccant and its purpose is to remove any moisture from the system. There's also a sight glass in it that can be used as a rough guess as to whether the system is low on refrigerant. It should be replaced any time the system has been opened for more than a couple of minutes.
The one near the compressor is a muffler. Its purpose is to quiet down compressor pulsations in the system. Not 100% necessary, just one of those nice things GM added to their cars to reduce noise and head off customer complaints.
The system's refrigerant quantity is measured in pounds so you'll have to convert that quantity to metric measurement. These cars usually take between 3 and 4 pounds of refrigerant if they're still on R12 refrigerant. If it's been converted to R134A, use about 75% of the recommended quantity of R12, i.e. if system calls for 4 lb R12, install 3 lbs of R134A.
The refrigerant quantity can be found in the factory Oldsmobile Chassis Service Manual or someone here will know the exact quantity for the 1971 A-body cars.
I have been looking for the service manual of my car on the internet but I have not found it.
If anyone has it, could you tell me the amount of refrigerant that the AC system should carry?
Thanks in advance.
Its on page 1C-20 of the 1971 Chassis Service Manual: "Amount of Refrigerant 12 in system...4 Lbs."
This is only a guide; what the car requires may vary. Remember that it may not take as much 134a as R12.
Thanks for the help.
Is it possible that you share with me the part where everything related to air conditioning comes from?
It is to send the information to the mechanic before making the air change, so that he can see all the components it has and its function.
Thanks in advance
You should not necessarily add a certain amount of refrigerant unless you are doing a complete vacuum and then fill with a mechanic's machine. If so, then use an amount.
If you are just adding refrigerant to a system that just needs a pound or so, you use a set of gauges and a table of pressure readings vs ambient temperature to gauge whether the system has enough refrigerant.
Keyboard, here's what you need. Get an original paper copy if possible. Sometimes the CD-ROM copies lose detail.
Your profile shows your location as ES. Is that Spain or Estonia? Most bigger ebay sellers will ship internationally.
Hi.
Thanks for the book, I will check in Ebay.
I am from Spain, so the shipping cost and customs are very expensive.
We left the AC system completely empty, so we had to load a good amount of oil, I already have it installed and it works correctly, I won't freeze inside the car, but it really is much more comfortable now.
Thanks for the help guys.
