Driers & Valves

Driers and expansion valves are used on all aftermarket a/c systems.  If a system has a drier it has to use an expansion valve, if a system has an accumulator is has to use an orifice tube.  The most common driers and expansion valves are listed on this website,   If you need a special application please contact us for availability.  The OE replacement driers on the website are the most common parts still available.  If you do not see the drier you need you may have to have yours rebuilt. 

What is a drier and why does a system require it:
The drier is used on many a/c systems. It receives refrigerant from the condenser. The drier is mounted either adjacent to the condenser or somewhere in line before the expansion valve. It consists of a tank, a filter, a drying (agent) desiccant, a pick up tube, and a sight glass (on some applications) it has several functions.
First the drier acts as storage tank. It receives the liquid refrigerant from the condenser and holds this liquid until the evaporator requires it. Requirements vary according to operations conditions.
Second the drier acts as a protection agent for the system. The portion of the drier that contains the desiccant absorbs moisture from the refrigerant. The desiccant is usually in the form of silica gel. It is important that the moisture be removed from the system, as it can be extremely harmful to the air conditioning system components and to the systems operation.
The sight glass is not used with R-134a, it was used on vehicles made before 1994 that used R-12 freon.

ACCUMULATOR
When an accumulator is present there is not a drier in the system, they perform the same function.
The accumulator is mounted in the low side of the system, at the outlet of the evaporator. The function of the accumulator is to store (accumulate) refrigerant and to filter and dry the refrigerant. The accumulator also contains a desiccant. If any liquid refrigerant passes out of the evaporator the accumulator will store it. Liquid refrigerant is harmful to the compressor. Moisture is also harmful to the air conditioning system.

Why Change the drier or accumulator?

It is the job of the drier or accumulator's desiccant to remove the moisture that may enter the system.
If too much moisture enters the system (due to component malfunction or hose leakage), the desiccant will have to be replaced. This replacement may require complete replacement of the drier or accumulator because the desiccant is normally not removable.
The drier or accumulator should be changed if the system is opened, or a leak occurs, or if the system has the symptoms of having moisture in it. Moisture that enters an R-12 system will combine to form hydrochloric acid (HCL), which is harmful to the components. Moisture that enters the R-134a system will not form any harmful acids, but will lower system efficiency. R-134a in a liquid form will not absorb much moisture, but in a vapor state R-134a can absorb large amounts of moisture. On both systems (R-12 and R-134a) moisture can also gather on the expansion valve or orifice tube and freeze. This blocks the flow of refrigerant and prevents the cooling action at the evaporator.

An expansion valve, which is located on the high side of the system, regulates the refrigerant going to the evaporator.  The expansion valve will cause all of the refrigerant to evaporate as it goes through the evaporator.  The valve will cause the refrigerant to change from high pressure to low pressure as it passes through the evaporator.  An expansion valve and an orifice will have refrigerant enter it at a high pressure, as the refrigerant passes through the valve the refrigerant flow will be restricted causing the refrigerant to "spray" out the other side of the valve.  This allows the refrigerant to vaporize as it passes through the evaporator, causing it to exit the evaporator as at a low pressure.

  1. Flare Expansion Valve With Female Equalizer Tube  

    Flare Expansion Valve With Female Equalizer Tube

    Part #14-9872
    Standard flare thermostatic expansion valve with a female (oil return line) equalizer tube. The valve has an equalizer tube and a sensing bulb. The fittings sizes are:
    3/4"-16 male flare thread; connects to the evaporator
    5/8"-18 male flare thread; connects to the liquid line which runs to the condenser
    1/4" female flare thread; connects to the suction side of the evaporator
    This valve is compatible with R-12 and R-134a refrigerants. Learn More
    $24.99

  2. Flare Expansion Valve  

    Flare Expansion Valve

    Part #14-9875

    Standard flare thermostatic expansion valve. This is the most common flare expansion valve used on aftermarket and original applications. The male fittings sizes are:
    3/4"-16 male flare thread; connects to the evaporator
    5/8"-18 male flare thread; connects to the liquid line which runs to the condenser
    This valve is compatible with R-12 and R-134a refrigerants.

    Learn More
    $19.99

  3. Universal Black O-ring Drier with Drier Strap  

    Universal Black O-ring Drier with Drier Strap

    Part #4-1000

    3/8" male O-ring drier 2.5" x 8" Black drier Great replacement for all aftermarket A/C systems. The Drier has a sight glass for use with R-12 refrigerant and two switch ports.

    This drier will have a drier strap included. If you are replacing an existing receiver drier and do not wish to have another drier strap, choose the option below to not include it.

    The drier can be used with all refrigerants

    Learn More

    As low as: $14.99

  4. Shorty Standard O-ring Receiver Drier With Drier Strap  

    Shorty Standard O-ring Receiver Drier

    Part #4-1001

    Short o-ring receiver drier that can be used on most aftermarket o-ring A/C systems. The drier has 3/8" male o-ring fittings, 5/8"-18 Threads, and a female switch port.
    The drier measures 2-1/2" x 5-1/2" tall, and has a sight glass on the top for R-12 systems.

    This drier will have a drier strap included. If you are replacing an existing receiver drier and do not wish to have another drier strap, choose the option below to not include it.

    The drier can be used with all refrigerants.

    Learn More

    As low as: $19.99

  5. Universal Drier with Push-On Fittings  

    Universal Drier with Push-On Fittings

    Part #4-1002

    Standard 3/8' male drier with Push-On Fittings.
    It works as a great replacement for the old slip on drier.
    2.5' x 8' Black drier

    This drier will have a drier strap included. If you are replacing an existing receiver drier and do not wish to have another drier strap, choose the option below to not include it.

    Great replacement for all aftermarket A/C systems.
    Great for all refrigerants
    Has a sight glass and two switch ports.

    Learn More

    As low as: $17.49

  6. Aluminum O-ring Receiver Drier  

    Aluminum O-ring Receiver Drier

    Part #4-1003

    Aluminum O-ring receiver drier that can be used on most aftermarket O-ring A/C systems. The drier has 3/8" male O-ring fittings, 5/8"-18 Threads, and two female switch ports on opposite sides of the drier.

    This drier will have a drier strap included. If you are replacing an existing receiver drier and do not wish to have another drier strap, choose the option below to not include it.

    The drier measures 2-1/2" x 8" tall, and has a sight glass on the top for R-12 systems.
    The drier can be used with all refrigerants.

    The Drier has a sight glass if you are using R-12 refrigerant and two switch ports.

    Learn More

    As low as: $19.99

  7. Chrome Receiver Drier with Polished Bracket  

    Chrome Receiver Drier with Polished Bracket

    Part #4-1004

    Chrome O-ring receiver drier with a polished aluminum mounting bracket. The drier has 3/8" male O-ring fittings, 5/8"-18 Threads, and two female switch ports on opposite sides of the drier.
    The drier measures 2-1/2" x 8" tall, and has a sight glass on the top for R-12 systems.
    The drier can be used with all refrigerants.
    Below is an explanation of the driers operation, and why they should be changed.
    The drier is used on many A/C systems. It receives refrigerant from the condenser. The drier is mounted either adjacent to the condenser or somewhere in line before the expansion valve. It consists of a tank, a filter, a drying (agent) desiccant, a pick up tube, and a sight glass (on some applications), the drier has several functions.
    First the drier acts as storage tank. It receives the liquid refrigerant from the condenser and holds this liquid until the evaporator requires it. Requirements vary according to operations conditions.
    Second the drier acts as a protection agent for the system. The portion of the drier that contains the desiccant absorbs moisture from the refrigerant. The desiccant is usually in the form of silica gel. It is important that the moisture be removed from the system, as it can be extremely harmful to the air conditioning system components and to the systems operation.
    The sight glass is not used with R-134a, it was used on vehicles made before 1994 that used R-12 freon.

    Learn More
    $59.99

  8. Universal Flare Drier  

    Universal Flare Drier

    Part #4-1005

    3/8' male flare drier 2.5' x 8' Black drier replacement for all aftermarket A/C systems with flare fittings. Works with all automotive refrigerants Has a sight glass and two switch ports.

    This drier will have a drier strap included. If you are replacing an existing receiver drier and do not wish to have another drier strap, choose the option below to not include it.

    The drier can be used with all refrigerants

    Learn More

    As low as: $14.99

  9. Horizontal O-ring Receiver Drier Straight In Straight Out  

    Horizontal O-ring Receiver Drier Straight In Straight Out

    Part #4-1006

    Horizontal o-ring receiver drier that can be used on most aftermarket o-ring A/C systems. The drier has 3/8" male o-ring fittings, 5/8"-18 Threads. This drier is perfect for using along frame rails, along the top or bottom of the radiator, or along the inner fender wells.
    The drier measures 1-3/4" diameter x 17" long, and has a sight glass for R-12 systems.
    The drier can be used with all refrigerants.
    Below is an explanation of the driers operation, and why they should be changed.
    The drier is used on many A/C systems. It receives refrigerant from the condenser. The drier is mounted either adjacent to the condenser or somewhere in line before the expansion valve. It consists of a tank, a filter, a drying (agent) desiccant, a pick up tube, and a sight glass (on some applications), the drier has several functions.
    First the drier acts as a storage tank. It receives the liquid refrigerant from the condenser and holds this liquid until the evaporator requires it. Requirements vary according to operations conditions.
    Second the drier acts as a protection agent for the system. The portion of the drier that contains the desiccant absorbs moisture from the refrigerant. The desiccant is usually in the form of silica gel. It is important that the moisture be removed from the system, as it can be extremely harmful to the air conditioning system components and to the systems operation.
    The sight glass is not used with R-134a, it was used on vehicles made before 1994 that used R-12 freon.

    Learn More
    $34.99

  10. Compact Horizontal O-ring Drier  

    Compact Horizontal O-ring Drier

    Part #4-1007
    Short horizontal O-ring drier with male o-ring threads. The drier is small enough to hide in the frame rail, under the fender well, near the condenser, or any other area that is out of sight. This drier will work with most aftermarket A/C systems. The drier is designed to sit horizontal not vertical.
    The drier measures:
    6-1/4" overall length
    3-3/4" long (canister)
    2-1/2" diameter
    Male o-ring fittings (3/8 MIO or 5/8"-16 threads)
    This filter drier can be used with R-12 or R-134a refrigerant. Learn More
    $29.99