* Repairing a broken system? This involves diagnosing the problem (compressor, condenser, evaporator, expansion valve, leaks, etc.), sourcing replacement parts (often requiring specific model and year numbers), and then performing the repair. This is a complex task, requiring specialized tools, knowledge of refrigerant handling (which is regulated and requires certification in many places), and possibly a vacuum pump for proper evacuation and charging. A shop manual specific to your 1993 Suburban's AC system is essential.
* Replacing the entire system? This involves removing the old system and installing a new one. Again, this is a significant undertaking requiring specific parts for your vehicle and expertise in AC system installation and refrigerant handling. You'll need a new compressor, condenser, evaporator, drier, hoses, and possibly other components.
* Converting from R12 to R134a? R12 refrigerant is no longer legal for use in most places due to its ozone-depleting properties. If your system still uses R12, it needs to be converted to R134a. This isn't simply a matter of adding a different refrigerant; it requires a thorough system flush and possibly replacement of certain components (o-rings, hoses) that aren't compatible with R134a. Improper conversion can damage the system. This should be done by a qualified professional.
* Adding AC to a vehicle that didn't originally have it? This is a major undertaking, requiring extensive fabrication, custom fitting of components, and a deep understanding of automotive AC systems. It is not a DIY-friendly project.
In short, unless you have significant experience working on automotive AC systems and the proper tools and safety equipment, you should *not* attempt any of these conversions yourself. The risks of improper handling of refrigerants, incorrect installation, and system damage are significant.
Recommended course of action: Take your 1993 Suburban to a qualified automotive AC repair shop. They have the expertise, tools, and refrigerant handling certification to diagnose and repair or convert your system safely and correctly. Provide them with the make, model, and year of your Suburban for accurate parts identification.
