Things You'll Need:
- Clean towel
- Retrofit kit
- Wrench
- Permanent marker
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Step 1
Have a service technician evacuate the air conditioning system in your car. This removes all of the R12 refrigerant from the system. This is usually free since R12 refrigerant is very expensive.
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Step 2
Look near the firewall to find the Low Pressure Side service port. It is located along the large line coming from the compressor. The cap is black and marked L. Remove the cap and look at the service port. If the port is a screw-type connector, you should continue with the retrofit. If you see a quick connect valve, the system already takes R134 refrigerant, so retrofitting it is unnecessary.
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Step 3
Clean the service port with a towel. This ensures that the retrofit connector properly adheres to the valve. Put the long retrofit adapter from your retrofit kit onto the port. Screw it on and tighten it with an adjustable wrench. Cover the adapter with the blue cap provided in the kit.
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Step 4
Locate the High Pressure Side service port. You can usually find it near the Low Pressure Side service port. Remove the red cap and wipe the port off with a towel.
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Step 5
Place the shorter adapter onto the port. Twist it using an adjustable wrench until it is securely fastened to the port. Place the red cap from the retrofit kit onto the adaptor.
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Step 6
Complete the Retrofit Identification sticker provided in the retrofit kit using a permanent marker. Remove the protective backing and place it on the interior side of the hood. This lets future owners and service professionals know that the system has been retrofitted.
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Step 7
Recharge the air conditioning system. See the related eHow titled "How to Recharge Air Conditioning with Freon in a Toyota Corolla."
