You can convert your old R12 system to R134A.
Air conditioning has become more than just a luxury these days, especially if you live anywhere where the temperature is hot and humid. If your car has recently stopped blowing cool air, then you may be considering fixing the air conditioning. The problem is that most automobiles older than 1995 are using the outdated R12 coolant, which carries a heavy price tag and requires a special license to purchase. Modern air conditioning systems use R134A coolant and you will have to retrofit your vehicle to use this type of coolant.
Instructions
1. Remove any old R12 refrigerant by taking your vehicle to a licensed professional that has access to an R12 recovery machine. Releasing R12 freely into the atmosphere is illegal and can damage the environment; always dispose of R12 properly by letting a licensed professional handle it.
2. Find the high side R12 service port by looking for the port that is located between the air conditioning compressor and condenser. Install the retrofit R134A high side service port by placing the new valve fitting over the old valve fitting and tightening it to 20-foot pounds with your torque wrench. Find the low-side R12 service port and install the retrofit R134A low-side valve fitting in the same way.
3. Connect a set of manifold gauges to the high and low pressure side of the air conditioning system. Evacuate the air conditioning system by connecting a vacuum pump to the manifold gauges and letting it run for one hour. Disconnect the vacuum pump.
4. Add R134A lubricant to the system by connecting a can of R134A lubricant to the manifold gauges and allowing the vacuum to draw it into the system, unless the R134A refrigerant that you are using contains lubricant. Check your system requirements for the exact specifications for how much lubricant to add. Remove the manifold gauges.
5. Check your owner's manual for the maximum load of air conditioning refrigerant that your vehicle requires. Hook up a T-valve hose to your air conditioning system on the low pressure side. Screw the T-valve onto a can of R134A.
6. Start your vehicle and turn the air conditioning compressor on and the fan on the "Maximum" setting. Place a thermometer inside of the vehicle, right in front of one of the vents. Turn the handle on the T-valve, puncturing the can and allowing the refrigerant to drain into the air conditioning system.
7. Turn the can upside down to help it drain and allow it to run for four to five minutes. Check the inside temperature of the air conditioning to ensure that it is starting to cool down and that your system does not have any refrigerant leaks. Continue adding refrigerant to your system until you have added 10 percent less R134A than the recommended maximum R12 value; otherwise, you could overfill it. Enjoy your cold air conditioning.
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