Can I Flush My AC Unit?

Drains and Hot Water

• The drainage system in an AC unit can easily clog due to sediment build-up or large debris. Sometimes the clog can be located deep in the drainage pipes where you cannot reach it. In this case, you can try flushing the system with hot water to try to dissolve and sweep away the sediment. Do not try to flush any other part of your AC unit. This include both air vents and refrigerant lines, which can be damaged by hot water.

Drains and Air

• You can also flush your drainage line with compressed air, if you have an air compressor available. This method may be more useful for smaller air conditioner systems that have longer drainage lines, such as those found in cars. It can also be useful for clearing up supply vents, since there is no danger of causing water damage using compressed air.

Chemicals and AC Drains

• Be hesitant to use chemicals on your AC drain. The chemicals may dissolve seals and damage parts of your drain. However, if you have a serious blockage problem, you can try flushing your line with a vinegar-and-water mixture to see if this helps to loosen any buildup. The vinegar acts as a light acid, which may help eat away at any bonds that are keep a clog from being washed away.

Auto AC

• An auto AC system is different from a home system. Auto air conditioning units use long tubes that must be disconnected before you can flush the system properly. There are solvents specifically designed for car AC flushes that you should use so that you do not leave any residue behind. Both liquid pour and aerosol flushes are available for these jobs.