My air conditioning stopped cooling?

1993 TOYOTA COROLLA
97,500 MILES • 4 CYL • FWD • AUTOMATIC
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1993 Toyota Corolla mileage: 97,500. My air conditioning stopped cooling again. I had it charged last year, and it worked fine all summer. I guess there might be a slow leak. I bought a converter kit "R-134a Retrofit and Charging Kit" and a canister of "R-134a Stop Leak and Detector". Since my car was charged by a licensed auto shop, am I to assume they used R-134a. Or is my 1993 corolla already R-134a equipped. What are the specific steps going about recharging my car because I never did this?
Oct 18, 2010 at 7:00 PM
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We do not recommend recharging your own automobile air-conditioning. If done improperly, you can injure yourself and damage your car. A licensed auto shop would have used R-134a if that is what the manufacturer required. The test ports are different sizes for the two different types of Freon.
Oct 18, 2010 at 7:03 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.