Is the 9 Blazer freon or R134?

I purchased a kit from the auto parts store. It has sealer, coolant, oil, etc. It says to drain the whole thing. I dodn't but just found the low side and put it in. That's been three years ago and it is still going strong. Some will tell you that it will ruin the system. I have done it in over twenty cars and never had a problem. If it does anything, it swells the seals which helps seal things up. The kit has adapters for any car but just make sure you put it in the low side as it can be dangerous which I'm sure you know. Hope this helps.

R134