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DIY Air Conditioning
Introduction


Does your air conditioning blow hot air?

This procedure will help you replace your A/C components so you can be cool in the summer!


ac.diagram

Here is the layout of the system. The A/C system is pretty simple.

The compressor compresses the freon to 250 psi of hot gas. The freon gas then goes to the condensor where it cools and tuns back into a liquid, but keeps its high pressure. It then goes to the receiver/drier which acts like a capacitor for the system. The freon liquid finally goes to the evaporator where the liquid enters the expansion valve and suddenly drops from 250 psi to 30 psi and instantly turns back into a gas. This massive pressure drop causes a super-cooling effect and turns the evaporator cold. The hot cabin air then goes through the evaporator and enters the cabin to cool your car! Finally, the low pressure gas goes back to the compressor to repeat the cycle.


Most problems with the A/C are caused by leaks. Since most A/C stuff wears out together, it's easiest and best to just replace all of the hoses and most components at the same time. This DIY procedure will walk you through the steps needed to repair your A/C system.



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