This could result in compressor damage which leads to system failure. B. a flooded evaporator and flooded compressor When the weather is hot, you dream about getting in your car with the air conditioning pumping out cold air. Liquid line restrictions can be caused by a restricted filter-drier, a restricted thermostatic expansion valve screen, a kinked liquid line, a bent lower condenser coil, or an oil-logged capillary tube. C. 1000 microns 96-a compressor thats has a broken reed valve ill cause these symptoms; high suction pressure and low discharge pressure: All of these problems reduce the cooling ability of your AC unit. This cooled air is dispersed back indoors (to a house or a room,) effectively lowering the temperature. Well, every part is important, but the evaporator is what determines the air temperature you feel inside the cabin which is effectively what keeps you cool all year long. There are a few ways to tell if the evaporator is the culprit: Well explain this in more detail a little later, but first, lets introduce the inner workings of an evaporator. A notable sign that you have a liquid line restriction is low pressure in your evaporator. A lot of symptoms can be indicative of various problems within the A/C system, so it's important to keep an eye out. The compressor compresses the refrigerant and the process of compressing it forces the refrigerant to give off excess heat which is exhausted out the coils. With a starved evaporator, the compressor and condenser will also be starved. Categories: Blog This entry was posted on Friday, July 29th, 2016 at . The heat causes the refrigerant to boil, which changes it to a low pressure vapor. No cold air from the AC system. data. If charged properly, a forced-air condenser will have 6-10 degrees of liquid subcooler. Please re-try again. C. 3 It isnt difficult to test the AC pressures as long as you have a high-quality set of gauges. B. low suction pressure C. 40 He knows what he's doing. 5 Signs Of Bad Evaporator Coil - HouseholdAir Our professionals can diagnose and repair evaporator coil issues to get your air conditioner working like new. d) it is not affected by dirt or frost build-up. It should also be noted. One of the first symptoms of a problem with the AC expansion valve or orifice tube is an underperforming AC system. If there is a low-temperature difference across the evaporator coil in your air conditioning system, you might have a refrigerant flow problem. Symptoms of a Bad or Failing AC Air Filter, Symptoms of a Bad or Failing AC Low Pressure Hose, Symptoms of a Bad or Failing Throttle Position Sensor. RELATED: 4 Symptoms of a Bad AC Pressure Switch (High or Low). The refrigerant passes through a narrow opening at which point it expands on the other side as a gas (think of a spray can). Hook up the AC pressure gauges. This cause the temperature of the suction line to drop, and just like in the evaporator, cause the condensation to freeze. Regularly cleaning your AC component is better than waiting for them to get bad. You could spend as little as $55 for this diagnostic test or as much as $400 in some cases. The hot liquid moves through the liquid line, into the building towards the evaporator coils. 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