Regarding the type of refrigerant: A 1995 Toyota Avalon almost certainly uses R-134a. However, you should not rely on this information. The type of refrigerant used is critical, and getting it wrong can cause serious damage.
Instead of attempting a DIY repair, take your vehicle to a qualified mechanic or A/C specialist. They will:
* Identify the correct refrigerant: They have the tools and expertise to determine the precise refrigerant your vehicle needs.
* Check for leaks: Adding refrigerant without addressing a leak is pointless and wasteful. They'll use specialized equipment to locate and repair any leaks in the system.
* Properly add refrigerant: They have the right equipment to add the correct amount of refrigerant and ensure the system operates efficiently.
* Check system pressure and performance: They will verify the system is operating correctly after the service.
Attempting to recharge your A/C system yourself is risky and could result in more significant problems and higher repair costs down the line. Professional service is the safest and most effective approach.