For 1990-2009 cars

The chemical stability of the refrigeration system plays an important role in the efficient operation and longevity of the A/C system.

When air, moisture or particulate contamination are introduced into the refrigeration system, the following results will occur:

• | The chemical stability of R-134a and polyalkylene glycol (PAG) synthetic lubricant will change.

• | The pressure/temperature symmetry will change.

• | The A/C system efficiency will be diminished.

• | Internal A/C system parts may corrode and/or wear in an abnormal manner.

Use the following general practices to maintain chemical stability in the refrigeration system:

• | Wipe away dirt and/or oil before you break a refrigerant connection. This will reduce the possibility of particulate contamination.

• | Cap, plug or tape both sides of an open connection as soon as possible. This will minimize the amount of dirt and moisture entering the system.

• | Ensure that the following remain clean and dry:

- | The tools being used for the repair

- | The surrounding area of the repair

- | The hoses and connectors for the ACR4 machine or manifold gage set

- | The replacement parts

• | When adding polyalkylene glycol (PAG) lubricant, ensure the transfer device and the container remain clean and dry to minimize moisture intrusion.

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

• | Before recharging an A/C system that has been opened, properly evacuate and vacuum test the system.

• | Service parts are dehydrated and sealed prior to shipping. Retain the parts in their sealed packages until you are ready to use them.

• | Ensure the parts are at room temperature before opening the packages. This prevents condensation on the parts from humidity in the atmosphere.

• | Attach the A/C service equipment quick-connects as soon as possible after removing the service caps.