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I have a c4 1991 tpi and it has quick disconnect couplings I suppose it was converted to r134a. The car was in a shop for an engine swap and had the AC removed. now it’s back on the car but needs to be flushed.
I want to use ACDOCTOR A/C gas, a new-generation refrigerant which is a replacement for the R-12 freon used in car air-conditioning systems up to 1994. what oil is suitable?
Alternatively I could use r134a, what oil type/ viscosity do I need?
I have a c4 1991 tpi and it has quick disconnect couplings I suppose it was converted to r134a. The car was in a shop for an engine swap and had the AC removed. now it’s back on the car but needs to be flushed.
I want to use ACDOCTOR A/C gas, a new-generation refrigerant which is a replacement for the R-12 freon used in car air-conditioning systems up to 1994. what oil is suitable?
Alternatively I could use r134a, what oil type/ viscosity do I need?
thank you
Not enough information to answer your question. When the conversion was done, was it a thorough changeout(flushed components, new orifice tube, new hoses etc) or was it a "gas and go"? Mineral oil(R12 useage) and PAG oil(R134A useage) do not play well together. If the conversion was done by someone with knowledge, they would have used Ester oil. As far as the ACDOCTOR gas, I have no idea what this is.(most likely a hydrocarbon based refrigerant such as propane or butane.)
I don’t know exactly what the previous owners did. I can only compare what I have to what a stock system looks like. The A/C was running well before the swap.
I don’t know exactly what the previous owners did. I can only compare what I have to what a stock system looks like. The A/C was running well before the swap.
the red and blue have quick disconnect couplings
Then you have a bit of a conundrum. If a proper conversion was done, the tech would have installed a label saying what gas he/she/they/them.......installed. What does the yellow sticker in your picture say? I would suggest your only path forward is to check the quantity of oil in the compressor and use Ester oil if any is required. Evacuate the system and install 134A. If you are from the U.S., R134A is readily obtainable without a license. I don't know why you would want to install some "snake oil" such as the ACDOCTOR stuff you mention.
Thank you
the yellow sticker is not about the AC and there are not stickers related to it. I plan to go for R134a, and will flush the entire system but I haven't decided on what type of oil to use. Any idea what POE or PAG viscosity I need?
I too would just use 134A, with a Denso it will cool well. Heck or spend a few dollars on some 12oz cans of R12 and get on with life. I have about 70lbs of that stuff I pick up here and there in the winter when it really has no value. My '89 was converted to 134A and cools well down in Houston....even better once I have the thing ceramic tinted.
I prefer PAO 68, not a fan of PAG. PAO is not hydroscopic.
Oil viscosity is usually determined by the compressor, if you're still using the stock one, I would probably go 100, [If you use PAG] but that's just a semi-educated guess. As far as all of this goes, I would highly recommend doing a very thorough flush before doing any of this as you have no clue what's in there now.
AC Doctor looks to just be a brand, and they offer the 3 main gas types, so if you decide to use that, it should be fine, as long as you use the correct gas type [134A]
Oil viscosity is usually determined by the compressor, if you're still using the stock one, I would probably go 100, [If you use PAG] but that's just a semi-educated guess. As far as all of this goes, I would highly recommend doing a very thorough flush before doing any of this as you have no clue what's in there now.
AC Doctor looks to just be a brand, and they offer the 3 main gas types, so if you decide to use that, it should be fine, as long as you use the correct gas type [134A]
AC Doctor gas is NOT R134A. As I suspected in my original post, it is a hydrocarbon based product. These companies are able to get away with selling this snake oil because they label it as R134a Replacement(usually in minute lettering). Here is a direct quote from their website:
"ACDOCTOR A/C gas is a new-generation refrigerant that replaces the R-134a (fluoro-chloro-ethane) refrigerant used in automotive air conditioning systems until 2016. ACDOCTOR gas for automotive air conditioning is a natural hydrocarbon gas that is safe for you, the environment and your car."
There is nothing "new generation" about it. Butane/propane has been around for countless decades.
Just a note here: make sure the PAG oil is double end capped type. What this refers to is : the capping of the oil molecules with a hydrogen atom at both ends of the molecule chain. This gives the oil molecules a stronger bond.
Just a note here: make sure the PAG oil is double end capped type. What this refers to is : the capping of the oil molecules with a hydrogen atom at both ends of the molecule chain. This gives the oil molecules a stronger bond.
Seriously dude???? You want the OP to walk up to the parts counter with a can of PAG 100 and ask the high school dropout behind the counter "Hey Hoss - is this stuff double end capped"?
Seriously dude???? You want the OP to walk up to the parts counter with a can of PAG 100 and ask the high school dropout behind the counter "Hey Hoss - is this stuff double end capped"?
So how is it you know what it is? But all kidding aside, it should say it right on the bottle and you won't find this stuff at an auto parts store. Google is your friend!
So how is it you know what it is? But all kidding aside, it should say it right on the bottle and you won't find this stuff at an auto parts store. Google is your friend!
WTF wouldn't go to an auto parts store to buy parts for their AUTO?? Christ almighty dude! It's PAG oil for the compressor on a car, not a top secret military "need to know basis" Thinglepopper!!!
WTF wouldn't go to an auto parts store to buy parts for their AUTO?? Christ almighty dude! It's PAG oil for the compressor on a car, not a top secret military "need to know basis" Thinglepopper!!!
Because most Corvette owners, especially Corvette Forum members are very particular about what products they use in their cars. This stuff is the very best PAG oil you can buy! That's why I suggested it. There's no need to get your shorts in a knot. Jeez...
Because most Corvette owners, especially Corvette Forum members are very particular about what products they use in their cars. This stuff is the very best PAG oil you can buy! That's why I suggested it. There's no need to get your shorts in a knot. Jeez...
Let me guess.......you're a chemical engineer or some other like egghead. Only one of these would suggest that you don't buy lubricants for your car from an automotive store because they don't sell the double ended, upside down, slid sideways PAG oil.
Can I drain the oil from the compressor through that bolt at the bottom of it or do I need to remove the compressor and turn it upside down?
I don't recall the actual layout of the compressor but since it has no gas anyways, I would remove it and turn it in such a way as to maximize the oil that is drained.
Let me guess.......you're a chemical engineer or some other like egghead. Only one of these would suggest that you don't buy lubricants for your car from an automotive store because they don't sell the double ended, upside down, slid sideways PAG oil.
r134a oil type
You want the OP to walk up to the parts counter with a can of PAG 100 and ask the high school dropout behind the counter "Hey Hoss - is this stuff double end capped"? 
