Expansion Valve / AC Expansion Valve for auto

Air conditioner auto parts: Expansion Valve / AC Expansion Valve

Expansion valve, which is also referred to as a throttle valve, is part of an air conditioner including the car. While the liquid flows through the narrowed part of the expansion valve, the pressure decreases, causing an increase in volume. This reduction of pressure takes place without mechanical power and also improves heat dissipation without the change of state, in which the heat content (enthalpy) remains the same. The causal increase in volume takes place either because of the gas expansion or liquid evaporation.

Typically, this working liquid flows as a nearly boiling liquid into the expansion valve, just to change its volume. During this process a part of the liquid evaporates, the other part remains liquid. Then, the liquid part gets into the evaporator where it absorbs heat from the environment. Thus, the air conditioner cools the interior of the vehicle. With the regular use of the conditioner expansion valve is constantly exposed to stress and it also wears out.

Air conditioner operating period is at least two years but some components may outwear and must be replaced. In addition to the expansion valve, also compressor, evaporator and condenser can fail. All necessary car parts you will find in our Internet shop. We offer high-quality products for all popular car brands. May be you need brake shoes? Just make a virtual visit to our online store and see the wide choice of goods. We will be glad to see you.

How to detect malfunction of the AC Expansion Valve valve

To detect a failure, check whether the pressure has changed. Use the devices intended for servicing the air conditioning system. First, connect the air conditioning service station to the fittings, then remove the glove box and connect pressure gauges. Next, connect one thermometer near the intake air duct, and another one - on the central grid. Then lift the hood, open the front doors, start the air conditioner in forced mode, and set the electric motor shaft rotation speed at 1,500 rpm. Let the system work for 10 minutes with these parameters, and take the readings of the pressure and the temperature. If the pressure readings deviate significantly from the norm, the component is faulty. Then inspect the expansion valve, which will let you determine whether the valve is ice-covered, or dirty.

You may notice that the air conditioner expansion valve needs diagnostics by the following symptoms:

  • the compressor periodically switches off;
  • operation of the cooling system is unstable;
  • the head pressure and the suction pressure are below the norm;
  • too much refrigerant is getting into the evaporator;
  • pipes and the evaporator are ice-covered;
  • the valve stays open for a long time;
  • cold air is regularly supplied.

The reasons of the AC Expansion Valve failures

The main reasons for the component failure or malfunction are mechanical impacts or climatic effects, as well as incorrect valve installation or adjustment. The use of refrigerant of wrong type results in clogging of the system and jamming of the expansion valve rod. Valve breakage is also caused by a clogged filter, and air or moisture in the air conditioning system. Too small flow cross-section of the expansion valve nozzle, or improper installation and adjustment will not only cause premature valve malfunction, but will also lead to incorrect operation of the entire air conditioning system of the vehicle.

Repairing and replacing the air conditioner expansion valve

Repair is intended for removing dirt from the component. In case of other defects, the valve is to be replaced. To do so, dismantle the glove box and the evaporator. If necessary, the refrigerant is recuperated with the help of the station. Then the defective component is removed, and a new one is installed instead. Before installation, the latter is to be coated with oil and fitted with seals. A new component is installed in the reverse order.

Popular Expansion Valve / AC Expansion Valve manufacturers
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  • Colour: Orange
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  • Refrigerant: R 134a
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  • Pressure hose connector diameter [mm]: 14,4
  • Heating / Cooling: from condenser to evaporator
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