Automotive AC Repairing and Replacing – Component Flushing

It is sometimes necessary to clean out the AC system with a flush substance. If the AC system has had a failure that released debris into the system or if the system is being retrofitted from R12 to R134a, it is advisable to flush out the system.

The parts of the system that are permissible to flush during a retrofit include the lines and hoses, the evaporator, and the condenser. Keep in mind that the condenser should not be flushed if any particles are present in the system. The parts of the AC system that are not flushable include the compressor, the dryer device, and any hose that has a muffler or filter incorporated.

The condenser must be replaced to ensure that it is open and clear any time that debris or particles have been present in the system due to the tiny passages that condensers have.

The flush substance can be purchased in various sizes from most parts supply stores. Below are some key points to follow when flushing parts of the AC system.

The internal passages on late-model condensers are very small, which means that the flush process will not remove particles that get trapped in the condenser. These condensers must be replaced if foreign debris enters into

AC flush solvent is available from several different manufacturers in various size containers. This solvent is used to remove old oil and other contaminants from lines, hoses, and heat exchangers in the AC system. A special injection kit is needed to flush AC components using air or nitrogen

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