Though there are several different ways to lay out all the ingredients of an auto a / c unit, you’ll always find five essential parts. Most of layout is shown in Fig. 1. So that you can troubleshoot your body, you’ll needs to be able to get the components and provide some idea what they do:
1. Compressor. The compressor takes low-pressure, cool refrigerant and helps it be hot by compressing it. 2 to 6 pistons that resemble the methods in your engine carry out the actual compressing. A V-belt of your engine drives the product, and a clutch on its front disconnects it if your air conditioner is deterred. (Some systems cycle the compressor don / doff to control the temperature from the car. Within these, the clutch is wired towards on/off switch and a thermostat.)
The compressor ought to be easy to find. Consider a comparatively large object having pulley and fan belt, two rubber hoses about a inch across, and valves the best that look which include the ones on the tires. Once you find it, locate the compressor clutch wire (there ought to be only one wire exploring the compressor), and figure out if there’s a fuse inline nearby. If that’s the case, note its rating, and buying a replacement to help keep as a spare within the glove compartment.
2. Condenser. The condenser removes heat in the high-pressure refrigerant gas, enough to cause the gas to condense and turn into a liquid. You can do this at a comparatively extreme temperature because the pressure is high at this point in the system. View in front in the car’s cooling-system radiator, and you’ll probably find another radiator-looking thing. You could confirm that it’s the condenser (rather than a transmission or oil cooler) by tracing a hose connected its top returning to the compressor.
Referred to as the “high side,” the section relating to the compressor as well as the expansion valve could see pressure as tall as 270 psi. Hoses from this section will be subject to more rapid deterioration as opposed to on the “low side,” though both sets bear inspection.
3. Receiver-drier. If your refrigerant turns into a liquid, it’s stored in the receiver until needed. While there, it passes through a filter to take off dirt and through desiccant to remove water. (It’s vitally important that the refrigerant stays dry. It combines readily with water to create hydrochloric acid, that would corrode the metal pans of this system.)
There’s a good chance that the receiver-drier would be near the condenser. Track it down by simply following the hose links out of the bottom in the condenser. You’ll know you’ve found the proper can-with-hoses when you choose one that has a roughly half-inch viewing window near its inlet. This is whats called the sight glass. After the air conditioner is working, you should see clear liquid inside. If it’s milky, you’ve got water while in the system; if it’s frothy or bubbly, there’s air within. Both conditions have to have the attentions from a qualified service person.
4. Expansion valve. The organization valve restricts refrigerant flow to keep high pressure upstream between it together with the compressor. As refrigerant sprays through the entire valve’s orifice directly into the evaporator, it turns originating from a liquid in to a gas, thereby absorbing heat. It evaporates for the reason that pressure is tight on the downstream side of this expansion valve. (Some systems take advantage of the expansion valve to manipulate temperature in the car by varying how much liquid refrigerant sprayed to the evaporator. In these, the valve will likely be connected to a thermostat.)
Go through hose with the outlet for the receiver-drier, and see if you possibly can find the expansion valve. On some vehicles, it’s hidden behind a panel.
5. Evaporator. This is often a radiator which works in reverse; as an alternative for radiating heat, it absorbs it. Most likely won’t have the ability see it, because it’s located inside the passenger compartment behind and under the dash. There’s a lover back there that blows air within the evaporator’s fins to aid with heat absorption. You must be able to find the low-pressure hose from your evaporator winding its in the past through the fire wall to the other connection around the compressor.
Since you now know what to watch out for, where to find it precisely what it does, relax and wait for something to get wrong. Then arm yourself with the accompanying Trouble-shooter’s Secrets for Auto A / c, and take charge.