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Welcome to the Auto A/C Parts Warehouse

Welcome to the A/C Parts Warehouse. You will find the most complete assortment of automotive air conditioning parts and tools available, all backed by unbeatable warranties and after sales technical support!

Water valve - Heater Control Valve

This type of shut off valve is included on every vehicle that has air conditioning. These are mechanical valves that operate...

Variable Displacement Compressor

A newer design of A/C compressor that helps eliminate some of the customer complaints regarding noises coming from the A/C system. This style compressor will...

Variable Displacement Compressor

A newer design of A/C compressor that helps eliminate some of the customer complaints regarding noises coming from the A/C system. This style compressor will ...

Vapor Lines

These are hoses, tubes or line assemblies that typically connect A/C components on...

Vapor (Refrigerant Vapor)

The gaseous state of refrigerant in the A/C system once it has changed state or boiled in the evaporator. In the A/C system...

Valves-In-Receiver (VIR) Assembly

An all in one design for refrigerant valves that was used on most General Motors A/C systems in the early 1970s along with many other GM Designed systems that were...

Vacuum

Commonly referred to as the absence of air, vacuum is a controlled, contained system or condition, where the actual pressure is...

Vacuum Reservoir

Typically a small canister mounted on or near the evaporator case under the hood of the vehicle, the vacuum reservoir is designed to do nothing more than...

Vacuum Pump

One of the most critical pieces of shop equipment required when servicing any auto A/C system. Vacuum pumps are nothing more than....

V-type compressor

A compressor with its pistons arranged in a vee-shaped configuration. Typically, this design...

Undercharge - Low Refrigerant (Freon)

Typically, an A/C system is undercharged when it has been determined that the system is low on refrigerant or freon. When the system is undercharged, the A/C evaporator will...

Thermostatic Expansion Valve TXV

The expansion valve actually provides a restriction in the A/C system in order to regulate the flow of refrigerant into the evaporator. It is at the expansion valve that...

Thermal Limiter Fuse

The thermal limiter is a fuse like device that was typically used on General Motors vehicles during the 1970s. The fuse was intended to...

Temperature Humidity Index

Also called the humidex reading, this is typically reported on weather forecasts in hot, humid climates. That is because...

Superheat

Whenever an A/C system is under a superheat condition, cooling performance will be lost. It is important to understand...

Superheat Switch

Used on General Motors A/C Systems throughout the 1970s, the superheat switch was a sensing unit that was installed...

Suction Throttling Valve (STV Valve)

Typically used on older A/C system designs, the STV valve has been replaced because of fixed orifice tubes and...

Suction Side

A/C Systems are divided into sides. Typically, they are referred to as the low pressure and high pressure sides. The low pressure side is ...

Suction Pressure

In an automotive A/C system, the suction pressure or suction side pressures is often referred to as...

Suction Line

On an automotive A/C system, this is the line assembly that connects...

Sub-Cooling

A term not frequently used in automotive A/C service and repair, sub-cooling refers to the continued cooling of a liquid once it has already been cooled enough to change from a vapor (condense) to a liquid. In the A/C condenser, when the vapor refrigerant is cooled, it will...

Store Policies

Silica Gel - Desiccant

Unlike residential systems, automotive A/C systems always include a drier or accumulator. That component is used to absorb moisture from the A/C system. In order to do that, ....

Sight Glass

Typically located on the top of the liquid line receiver drier in automotive A/C systems, the sight glass...

Short Cycling - Short Compressor Cycle

The term short cycling refers to the compressor cycling operation on an automotive A/C system where...

Shaft seal - A/C Compressor Shaft Seal

Every A/C compressor includes a shaft seal. This is a unique seal in the A/C system because...

Service Port - Charge Port

The auto A/C system includes two service ports, also commonly called...

Service Hose - Charge Hose

Every A/C manifold gauge set will include service hoses also commonly called charge hoses. They are...

Schrader Valve - Valve Core

Each charge port or service port on an A/C system includes a spring loaded valve core that provides...

Refrigeration Oil - A/C Compressor Oil

Also commonly called A/C Compressor oil, every A/C system includes between 8 and 12 ounces of oil, only for the purpose of...

Reed Valves

In order to create the suction and discharge sides of the A/C system, A/C compressors create a suction on the low side and then compress the vapor refrigerant and pump it to the high side. The suction and discharge flor of refrigerant is controlled by...

Receiver Drier

Not to be confused with accumulators, the receiver drier is a metal container that performs a few different functions on the A/C system. Most importantly, the drier....

Ram Air

A term that refers the incoming air that is forced through the condenser (and engine cooling radiator) when the vehicle is in motion. Although most think that this ram air enters through the vehilces grill, the truth is...

Radial A/C Compressor

An A/C compressor design where the pistons radiate out from the centerline of the compressor. A typical example would be the...

Purging

An auto A/C term that is frequently confused with other services, purging the A/C system is really nothing more than...

Pump down

Another term that refers to evacuating or purging the A/C system of air. Typically performed with a...

psi-psig

These are abbreviations commonly used when discussing A/C terms. They represent...

Programmer

On some vehicles equipped with automotatic or semi-automatic A/C controls, where the system regulates temperature settings and fan speeds, the main control is referred to as...

Privacy Policy

Pressure Sensing Switch - Cycling Switch

Typically, all automotive air conditioning systems that use a cycling clutch system, where the compressor cycles on and off depending refrigerant requirements, the system will include...

Plenum

The plenum is a term used for the part of the auto A/C system that is located under the dash of the vehicle and is made up of...

Pilot Operated Absolute (POA) Valve

Like the suction valve, the POA valve is a suction throttling device that is located at the outlet of the A/C evaporator and...

Overcharge

This is a term that refers to a condition that occurs when too much refrigerant and/or refrigerant oil has been added to the A/C system. The overcharge condition is...

Oil Bleed Line

An external oil tube which directs oil from the bottom of the evaporator into the suction line of the A/C system whenever the...

Muffler

Typically located right at the compressor discharge, an A/C muffler is nothing more than a...

Mode Door

The plenum of the automotive air conditioning system works to direct incoming air through the dash vents, defroster or floor vents. This air distribution is effected by...

Manifold

Typically a part of the manifold gauge set, the manifold is usually made from aluminum or brass and is used to control...

Manifold Gauges - Presure Gauges

The most basic tools required to test and service any automotive A/C system are manifold gauges. They are a testing assembly consisting of...

Magnetic Clutch

Auto A/C compressors are belt driven. The pulley that the belt attaches to will turn constantly whenever the vehicle is running. The magnetic clutch is a coupling device that will allow the internal portion of the compressor to...

Low Suction Pressure

Suction pressures refer to the low side pressure gauge readings on an A/C system. When those pressures drop below...

Low Side

Every A/C system is divided into sides. Not only does the system have a liquid and vapor side, but it also has a high pressure and low pressure side. The low pressure side is...

Low Side Service Valve - Charge Port

Typically the A/C system will include two charge ports or service valves. One each for the high and low side of the system. The low side service valve or charge port will be....

Low Pressure Cut Out Switch

An electrical switch that is wired into the clutch circuit of the A/C compressor, the low pressure cut out switch will sense refrigerant pressures and...

Low Head Pressure

The A/C system is divided into two distinct sides. The low and high side. There are typical pressure gauge readings considered to be normal for each side. When the high side pressure...

Liquid Line

A/C systems are not only divided into high and low pressure sides, they are also divided into liquid and vapor sides. The liquid line of the A/C system is referring to the line that....

Leak Detector

One of the most common failures on automotive A/C systems is the loss of refrigerant through leaks. Service technicians will utilize a leak detector in order to...

Latent Heat

The term latent is a Latin term meaning hidden. It is used to describe the heat that is consumed or released when a substance changes state. In an A/C system, when the liquid refrigerant in the evaporator absorbs heat and boils or changes state, the heat it absorbs is...

Latent Heat of Evaporation

Every A/C system cools because the refrigerant in the evaporator is actually boiling and changing state to vapor refrigerant. In order to cause a liquid (refrigerant) to boil, it must, like water, absorb heat. The heat that is absorbed if known as....

Latent Heat of Condensation

Refrigerant in the A/C system absorbs heat in the evaporator. When it does that, it changes state to vapor refrigerant, but the vapor does not change temperature. That is because the heat absorbed was consumed to cause the change of state, and the heat it absorbed is known as latent heat. When that refrigerant reaches the condenser,....

Inches of Mercury - ( in-Hg )

In auto A/C service, vacuum is an extremely important part of regular service. Just before the system is recharged, a vacuum pump is connected to pull vacuum. That level of vacuum is expressed...

In-Car Sensor

Vehicles with automatic temperature control systems will include various sensors that will help the controls maintain a more even and comfortable in car temperature. Part of the sensor string that helps maintain proper temperatures is the...

Humidity

Humidity can seriously effect the pressure gauge readings on your auto A/C system. The reason that humidity effects the pressures is that technically, high humidity alone can....

How the Auto Air Conditioning System Really Works

Now available on this 2 DVD set you will quickly understand all the principles behind how the automotive air conditioning system really works. Before you start to diagnose or repair any A/C system, you need to understand that the A/C system is really...

High Side Service Valve - High Side Charge Port

Also called a charge port or access port, the high side service valve will be located on the system somewhere between...

High Side

Every A/C system is divided into sides. The low side starts at the expansion valve or orifice tube, includes the evaporator and the hose that returns from the evaporator to the compressor. Low side accumulators are also part of the low side of the system. On the other hand, the high side of the system starts...

High Pressure Relief Valve

High side pressures are typically between 2 and 2 and one half times the ambient air temperature as expressed in degrees Fahrenheit (degrees F). However, refrigerant overcharge or extreme humidity can cause those pressures to rise excessively, and when that happens, the high pressure relief valve will...

High Pressure Line(s)

Every A/C system is divided into two sides. The high side is high pressure, high temperature refrigerant while the low side is low(er) pressure and temperature. The high pressure lines are the ones that...

High Load - Heat Load

This is a condition that causes the A/C system to operate constantly to maintain maximum capacity. On systems with cycling clutches (CCOT) and orifice tubes, a high load or high heat load would mean that the compressor...

Hg (in-Hg)

The chemical symbol for Mercury. It is used when...

Heater Core

Although not part of the A/C system, the heater core is another heat exchanger. In a vehicle, the heater core is located in the same case as the evaporator because automotive A/C systems are known as...

Heat Quantity

Heat is measured in different ways. When you use a thermometer, you are measuring the intensity of heat and that is expressed in degrees Fahrenheit or degrees Celsius. The quantity of heat is measured by...

Heat Index

Also referred to as the humidex, the heat index is a number that represents the effect of both the ambient air temperature and...

Heat Exchanger

Air conditioning is all about heat and heat transfer. That is why every A/C system includes two heat exchangers. A heat excahanger is nothing more than...

Heat

Heat is a form of energy that we all experience every day. That is because everything has some amount of heat. That is, everything has some amount of heat unless it reaches a temperature of...

Head Pressure

Head pressures represent the pressure of the refrigerant in the A/C system on the...

H Valve - Block Type Expansion Vavle

Originally used on Chrysler vehicles, the H valve or block type expansion valve as it is referred replaces the conventional Thermostatic Expansion Valve (TXV). Besides the appearance of the valve, the biggest difference is that the H Valve eliminates...

Gauges or Gauge Set

The one essential diagnostic tool required for every air conditioning service procedure. For complete details, see Manifold Gauges.

Freeze Up

This term refers to two possible failures in an auto A/C system. On systems using a thermostatic expansion valve, a freeze up occurs when...

Ford Fixed Orifice Tube - FFOT system

Like the Cycling Clutch Orifice Tube A/C system that General Motors developed in the late 1970s, the FFOT system is...

Foaming

In auto A/C systems, foaming is a term that is used to refer to the formation of small bubbles in the refrigerant oil. That typically happens when...

Flush - Flushing A/C Systems

Flushing or cleaning the A/C system internally is one of the most important steps in auto A/C service to restore the system when there is any...

Filter - In Line Filters

Auto A/C systems require filters in order to trap contamination and debris. Understand that it takes less than one tenth of a teaspoon of debris to cause serious problems in any A/C system. That debris is a result of ...

Feedback Potentiometer

The feedback potentiometer is a variable resistance device used on older automatic temperature control systems where the in car temperature could be set and the system would maintain that temperature using both air conditioned and heated air. The feedback potentiometer...

Fan Clutch

Most engine driven fans on vehicles now incorporate a fan clutch. The clutch is actually a drive coupling that is filled with a viscous fluid that will...

Fahrenheit

One of the commonly used temperature scales that measures the intensity of heat. In Fahrenheit, water freezes at 32 degrees and...

External Equalizer

Some conventional type expansion valves which use a capillary tube sensing device, also include an external equalizer tube. The external equalizer is actually...

Expansion Valve

Every automotive A/C system includes an expansion valve or expansion device of some sorts. The typical expansion valve, also referred to as a thermostatic expansion valve is...

Expansion Tube - Orifice Tube - CCOT

An expansion tube, commonly referred to as an orifice tube is used on some A/C systems to replace the conventional thermostatic expansion valve or TXV Valve. The expansion tube, also known as a fixed orifice tube, is a device that ...

Evaporator

Every air conditioning system includes two heat exchangers. That is because air conditioning is all about heat transfer. The evaporator is one of those heat exchangers. In order to remove the heat from the air entering the vehicle, the A/C evaporator ....

Evaporator Temperature Regulator Valve - ETR Valve

Depending on the A/C system design, the evaporator pressure or temperature can be controlled in a variety of ways. On early model Chrysler Corporation A/C systems,...

Evaporator Pressure Regulator Valve - EPR Valve

Early Chrysler Corporation A/C systems utilized EPR valves to maintain the proper refrigerant pressures in the evaporator. The ERP Valve was...

Evaporator Equalized Valves in Receiver - EEVIR- VIR

A design change made on General Motors A/C systems in the early 1970s incorporated the expansion valve, suction valve and receiver drier into one unit known as a VIR assembly or Valves in Receiver. A slight design change to that was the...

Evacuate A/C system

Evacuating an A/C system is the process of pulling the A/C system into a vacuum. This is one of the most critical processes...

Equalizer Line - External Equalizer Tube

An equalizer line is typically part of come conventional thermostatic expansion valves or TXVs. The equalizer line should not be confused with the temperature sensing capillary tube. Very little refrigerant passes through the equalizer, even though the line will usually actually thread into the low side line of the A/C system at...

Drying agent

Unlike commercial A/C systems, auto A/C systems have to contend with moisture. That is because automotive A/C systems include flexible rubber hose sections that actually allows...

Drier - Receiver Drier

Automotive A/C systems must have a means of trapping and holding moisture that may get into the system. One way of doing that is by using a receiver drier. The drier is usually...

Discharge Air

The A/C system is designed to remove the heat from the air that enters the vehicle. In doing that, it provides temperature control and passenger comfort. When diagnosing auto A/C systems, it is common to check the...

Discharge A/C System

Whenever servicing auto A/C system or changing components, the A/C system has to have the refrigerant removed so that the system can be opened. Removing all or part of the refrigerant from the A/C system is commonly referred to as...

Dichlorodifluoromethane

The chemical substance (CC1 F ) used in earlier automotive air conditioning systems to absorb, carry and release heat. Dichlorodirluoromethane...

Dicharge side

Every auto A/C system is divided into sides. There are the liquid and vapor sides of the system, and there are also the high and low sides of the system. The high side or high pressure side of the A/C system is commonly referred to ad the discharge side because...

Desiccant

Automotive air conditioning system suffer problems when they get contaminated with moisture. That occurs over time as water droplets, at the molecular level, pass right through the membrane of the rubber hose. That water causes serious problems when mixed with refrigerants. That is why auto A/C systems require a...

Dehumidify

Every automotive air conditioning system performs four basic functions to help improve passenger comfort and maintain temperature control. Besides cooling the air in the vehicle, the A/C system also...

Cycling Clutch Orifice Tube - CCOT A/C System

General Motors introduced the cycling clutch orifice tube A/C system in the 1977 model year. The unique advantage to having a cycling clutch with a fixed orifice tube was that...

Cycling Clutch A/C System

On any auto A/C system, the compressor operates in order to pump and circulate the refrigerant. In order to reduce the use of the compressor and save resources like fuel, some A/C systems are designed to turn the compressor off when not required. Those A/C systems are referred to as...

Corrosion in Auto A/C Systems

Corrosion in auto A/C systems is one of the leading causes of A/C systems failures. Corrosion, which is nothing more than the eating or wearing away of the A/C components in the system, is usually caused by the formation...

Control Head

Every auto A/C system provides controls in the passenger compartment. Those controls are typically mounted onto one assembly and that assembly is mounted on the dashboard of the vehicle. That entire assembly, which typically includes a temperature selector, mode selector, blower control switch and possibly a temperature knob or lever is considered...

Contaminants in A/C Systems

Auto A/C systems can become contaminated quickly. That is usually a result of excess moisture that is in the system and can not be trapped or held by the drier. When that happens,....

Condenser

The condenser is one of two heat exchangers that is included on every A/C system. Typically mounted at the front of the vehicle, directly in front of the engine cooling radiator, the condenser has only one function in the auto A/C system. That is to...

Condensation

When looking at the auto A/C system, condensation actually occurs in a couple of ways. Condensation is when a vapor or gas is cooled so that it changes state to become a liquid. In the A/C system, that occurs all the time in the condenser, because vapor refrigerant is being cooled. When that occurs, it changes state back to liquid. However, there is also condensation that occurs at the evaporator. The typical sign of a good working A/C system is when you see...

Compressor Shaft Seal

The auto A/C compressor includes several different seals. Typically, body seals are o-ring seals that prevent refrigerant from leaking externally. Internally, finely machined surfaces and gaskets seal the high pressure discharge side of the compressor from the low pressure suction side of the compressor. In all cases, those seals are static. They do not move. The only moving seal on the A/C compressor is the shaft seal. That is because the shaft seal must prevent refrigerant leaks while sealing on the main shaft of the compressor and...

Compressor Cut Off Switch

The A/C compressor is a component that circulates and pumps refrigerant throughout the auto A/C system. It takes low side vapor refrigerant and compresses it to become high pressure, high temperature refrigerant that is discharged to the condenser. However, in cases where the A/C condenser can not properly cool that refrigerant and high side pressures begin to rise, the compressor cut off or cut out switch will...

Compressor - A/C Compressor

Considered to be the heart of the air conditioning system, the compressor pumps and circulates the refrigerant through the system. Replacing the A/C compressor is typically one of the most expensive auto A/C system repairs. For that reason, extra care should be taken to assure that it never runs out of lubrication. Understand that typically, the compressor is the only moving part in the system and is the only reason that the A/C system includes oil. The compressor is also a component that splits two different sides of the system. The A/C compressor suction...

Compound Gauge - Low Pressure Gauge

Every manifold pressure gauge set includes two color coded gauges. Typically, the high pressure gauge is read while the low pressure gauge is blue. High pressure gauges usually provide pressure readings up to four or five hundred psi, while low pressure gauges typically go to about 150 psi. The biggest difference in the low side gauge is that it is commonly called a compound gauge, because it not only shows pressure, but...

Cold

We all think about air conditioning as being cold or that it makes cold air. That really is not what happens. Air conditioning is really all about heat. That is because everything in our environment has some amount of heat in it. It is only when a substance reaches a temperature known as absolute zero that it no longer contains any heat. Therefore, you should understand that cold is not...

Clutch Pulley or Rotor

Every auto A/C compressor uses an electro magnetic clutch assembly to operate the compressor. That assembly includes a coil to create the magnetic field, a clutch plate attached to the main shaft of the compressor which will engage and disengage the compressor and a pulley or rotor...

Clutch Field - Clutch Coil

Every automotive A/C compressor clutch assembly is made up of three distinct components. The clutch hub or clutch plate is the front most component that will engage or click when the compressor engages. The pulley utilizes a bearing and is mounted on the front head of the compressor, turning with the belt attached. Behind the pulley...

Clutch Cycling Switch

One of the most common auto A/C system designs is the cycling clutch configuration. Utilizing a cycling clutch means that the A/C system can provide proper cooling performance while not having to keep the compressor engaged all the time the A/C system is working. Instead of using valves to control the flow of refrigerant throughout the A/C system, the cycling clutch system turns the compressor on and off as required. Turning the compressor on and off is referred to as cycling and that is...

Clutch - Electromagnetic Compressor Clutch

Unlike commercial or residential A/C compressors where the motor is integral to the design, every automotive A/C compressor design is belt driven. With the use of a compressor clutch, the A/C compressor can be engaged and disengaged as required. The clutch assembly on automotive A/C compressor is typically referred to as an electro magnetic clutch. That is because...

Charging Station

Any automotive A/C system can be serviced and recharged using manifold gauges, a vacuum pump and some method to measure or weigh the amount of refrigerant being charged into a system. Although this method is effective, more automated systems have been developed in order to save the service technicians time and provide a single work station to perform all functions. Known as charging stations, they will typically be made as...