For 1990-2009 cars

The efficient operation and the life of the A/C system is dependent upon the chemical stability of the refrigeration system. When foreign materials such as dirt, air or moisture contaminate the refrigeration system, the following conditions may occur:

• | A change of the stability of the Refrigerant-134a (R-134a) and the Polyalkylene glycol (PAG) oil

• | An effect on the pressure-temperature relationship

• | A reduction in the efficient operation of the A/C system

• | Corrosion of the moving parts

• | Abnormal wear of the moving parts

Observe the following general practices in order to ensure the chemical stability in the system:

• | Before you break a refrigerant connection, wipe away any dirt or oil in order to reduce the possibility of dirt entering the system.

• | Perform one of the following procedures on a broken refrigerant connection as soon as possible.

| This will prevent dirt, moisture or foreign materials from entering the system:

- | Cap the connection.

- | Plug the connection.

- | Tape the connection.

• | Keep your tools clean and dry.

| This includes the following items:

- | The manifold gauge set

- | Replacement parts

• | Ensure that the transfer device and container are exceptionally clean and dry when you are adding PAG refrigerant oil.

| This will ensure that the refrigerant oil remains as moisture-free as possible.

• | Do not leave the A/C system open any longer than necessary.

| When you open the A/C system, have everything that you will need ready and handy so that you will be able to perform the operation in as little time as possible.

• | Any time that you open the A/C system, properly evacuate the system before you recharge the system with R-134a.

• | All service parts are dehydrated and sealed prior to shipping.

| Leave the service parts sealed until just prior to making connections.

• | Ensure that all parts are at room temperature before you uncap the system.

| This prevents condensation of moisture from the air entering the system.

| If, for any reason, you remove the caps, but you do not make the connections, reseal the parts as soon as possible.