The easiest way to determine the correct type of refrigerant for your vehicle is to check the year it was made.  All vehicles built after 1995 use R134a.  If your vehicle is older than that, it likely used R12.  You cannot refill R12 refrigerant on your own. If your vehicle uses R12, you should schedule an appointment with an auto repair specialist to convert it. In order to read the gauge on the refrigerant, you need to know the current temperature in your environment.  Refrigerant occupies a different amount of space within the can and air conditioning system at different temperatures, causing the gauge to read differently at different times.  Knowing the ambient temperature will allow you to effectively read the gauge on the refrigerant can. When refrigerant expands to take up more space, it increases the pressure in the can. Your air conditioning system will have two service ports: a low side and a high side port.  When recharging your air conditioner, you will need to locate and identify the low side service port.  You can find the low side service port by following the lines from the A/C compressor until you find a nozzle near the bottom of the car. Refer to your vehicle’s service manual to help you locate the port if you are unable to. Make sure you don’t clog the service port with any grime or debris by wiping off the port, cap and area around it with a rag.  Wipe the cap and the line first, then remove the cap and wipe off the port itself. You can spray brake cleaner onto the line to help you clean it if need be. Take the hose that comes with the refrigerant refill kit and connect it to the low side service port you identified earlier.  Make sure the opposite end of the hose is connected to the nozzle on the can.  If your can came with a gauge, the hose should be connected to the nozzle on the gauge and then to the can. The hose should be long enough to allow you to connect it to the port without placing the can all the way into the engine bay. Read the gauge display while taking the ambient temperature into account to determine what level the refrigerant is currently at.  Once you begin spraying, you will need to keep an eye on the gauge to determine when the system is full.  Keep an eye on the gauge throughout recharging the system to know when to stop. Read the instructions on the can if you are unsure of how to read the gauge.
اشترِ نوع المبرد المناسب لسيارتك. تحقق من درجة حرارة الجو باستخدام ترمومتر. ابحث عن مدخل خدمة جانب الضغط المنخفض لمكيف الهواء. استخدم خرقة لتنظيف المنطقة حول مدخل الخدمة. وصل خرطوم الشحن إلى مدخل خدمة الجانب المنخفض. استخدم مخطط ضغط الهواء المحيط لتحديد الضغط.