How much oil needed in AC system?
Thread Starter
Drifting
Joined: Nov 2003
Posts: 1,634
Likes: 4
From: Northern NJ
St. Jude Donor '04 & '05
How much oil needed in AC system?
My 84 was converted to R-134 by a PO. Currently it blows slightly cool but not cold. Compressor is a little noisy but the system does seem to hold pressure. No leaks that I can tell. W/o all the circumstances, I suspect between the oil, dyes and sealers in the system, there is not enough actual R-134.
I have an accumulator and a seal kit coming this week. After changing the parts I'm having the system "vacuumed" by a friend who is a commercial AC tech to try and get as much of whatever is in there, out. I searched for and read many recent threads about AC and noted it was indicated to use the correct oil for your vettes compressor.
My questions are:
1)What is the correct R-134a oil for an R4 compressor?
2)How much of this right oil does my 84's system need?
3)Approx how much R-134a should the system be charged with? I've heard 80% of the R-12 amount. Is this correct?
4)R-12 system indicates in two different spots both 2.25lbs and 2.75 lbs. Which is correct to use as a starting point?
TIA
I have an accumulator and a seal kit coming this week. After changing the parts I'm having the system "vacuumed" by a friend who is a commercial AC tech to try and get as much of whatever is in there, out. I searched for and read many recent threads about AC and noted it was indicated to use the correct oil for your vettes compressor.
My questions are:
1)What is the correct R-134a oil for an R4 compressor?
2)How much of this right oil does my 84's system need?
3)Approx how much R-134a should the system be charged with? I've heard 80% of the R-12 amount. Is this correct?
4)R-12 system indicates in two different spots both 2.25lbs and 2.75 lbs. Which is correct to use as a starting point?
TIA
Team Owner
Joined: May 2002
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Racer
Joined: Jul 2005
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From: Almost Northern Virginia
Cruise-In VII Veteran
St. Jude Donor '06
My 84 was converted to R-134 by a PO. Currently it blows slightly cool but not cold. Compressor is a little noisy but the system does seem to hold pressure. No leaks that I can tell. W/o all the circumstances, I suspect between the oil, dyes and sealers in the system, there is not enough actual R-134.
I have an accumulator and a seal kit coming this week. After changing the parts I'm having the system "vacuumed" by a friend who is a commercial AC tech to try and get as much of whatever is in there, out. I searched for and read many recent threads about AC and noted it was indicated to use the correct oil for your vettes compressor.
My questions are:
1)What is the correct R-134a oil for an R4 compressor?
2)How much of this right oil does my 84's system need?
3)Approx how much R-134a should the system be charged with? I've heard 80% of the R-12 amount. Is this correct?
4)R-12 system indicates in two different spots both 2.25lbs and 2.75 lbs. Which is correct to use as a starting point?
TIA
I have an accumulator and a seal kit coming this week. After changing the parts I'm having the system "vacuumed" by a friend who is a commercial AC tech to try and get as much of whatever is in there, out. I searched for and read many recent threads about AC and noted it was indicated to use the correct oil for your vettes compressor.
My questions are:
1)What is the correct R-134a oil for an R4 compressor?
2)How much of this right oil does my 84's system need?
3)Approx how much R-134a should the system be charged with? I've heard 80% of the R-12 amount. Is this correct?
4)R-12 system indicates in two different spots both 2.25lbs and 2.75 lbs. Which is correct to use as a starting point?
TIA
Estes 100 oil is needed for 134a and the system takes 8 ounces total.
Don't forget to put in a new deverter in it also they can get clogged.
You should refill the system till you have 25 to 28 lbs of pressure on the low side while running max air.
The top hose going into the ac evaporator should be cold but not icy.
Instructor
Joined: Jan 2005
Posts: 120
Likes: 0
From: Fountain Colorado
Unless the system is completely clean of all oil which it won't be the only way to add the correct amount of oil is to empty each component you take off to replace in a measuring cup. Then only add the new oil to that amount. The oil likes to sit everywhere so just filling it to specs will overfill it and once again cause poor cooling performance. I do all mine and my friends vehicles. Have your friend get some HOTSHOT it works with 12 and 134A as a drop in replacement. No fussing with oil types.
