"Harbor freight has several types of compressors..." The Harbor Freight item was the vacuum pump. I'd post a link to one that I think is it, but not sure if that would violate forum rules. Suffice it to say, it was around $100 a couple of years ago. Pretty sure it's the one they have for 8...

Just noticed this, " Since I completely charged the system with refrigerant before start up" Details on that if remembered. How deep a vacuum, type of pump, etc, the questions go on. Use of refrigerant scale, vacuum gauge, etc etc. I only bring this up because you are essentially starting...

I find the wording in your post a little confusing. On one hand you make it sound like you are doing a fresh conversion to your car, on the other hand it sounds like you are making a repair to an existing 134 conversion I just noticed this part of your post. Sorry for the confusion. I called it a &...

Yes, that's why I was considering flushing the original TF condenser. When you say that flushing never worked here, what was the biggest cause of failure?... not getting clean enough, or trapping the solvent, or both? I haven't found the sticky that you refer to. But it may be the Hecat pdf that Tim...

Thank you for your response. That all seems perfectly reasonable to me. The manufacturer's spec on the oil type is PAG 150. I'm not sure I mentioned it, but the compressor is an R4. A funny thing about TF condensers and R134a... I have a 1996 Chevy van with both front and rear air (Merry Miler conve...

I watched a video from the compressor manufacturer, that indicated... R134a = 80% of R12 amount. PAG oil = 20% of R134a amount. This was said in the context as a good guideline, not a hard-fast rule. However, when applied to my question, the result is interesting... 80% of 50 ounces R12: 50 x 0.8 = ...

I have a 1991 Chevy Caprice that (of course) originally used R12 and mineral oil. The online charts that I find, all say 50 ounces R12 refrigerant, and 8 ounces of mineral oil. This car hasn't been R12/mineral oil for years. I know that 50 ounces of R134a is too much, and should be less by some vary...

I am by no means an auto ac pro. But I've been DIY filling R134 (yes, small cans) via liquid into the LOW SIDE for years. This is done with the ENGINE OFF. I use a small space heater on a cart to warm the can, with a good ole window fan on the condenser. Heat the can up in the upright position a lit...

Tim, thank you for your recommendation. The HECAT pdf is also very helpful and great information to have. Even if my idea wouldn't be your first choice... do you have an opinion about denatured alcohol, followed by a bona-fide flush solvent? Keep in mind, I ask the question in the context of everyth...

I've heard a lot of different recommendations concerning what flush solution to use. Many have said all kinds of "off the shelf" solvents like denatured alcohol, paint thinner, acetone, etc. Then others have said to never use those, but rather, only use products that are designated as ac f...