How to Locate the Expansion Valve on a Peterbilt 379 AC System

The Expansion Valve on a Peterbilt 379 AC System is located at the firewall just above the condenser.

Peterbilt 379 Ac Expansion Valve Location

The Peterbilt 379 AC Expansion Valve is located where the cabin meets the engine in the air conditioning unit. It is used to control the flow of refrigerant within the air conditioning unit, helping to regulate temperatures inside the cabin. Knowing where to find and how to replace an expansion valve can be a tricky process, so it’s important not to attempt it if you don’t feel comfortable with the installation or repairs. This overview will provide helpful information on locating and replacing your expansion valve along with some useful tips for keeping your truck at optimal performance.

Identifying the Expansion Valve

The expansion valve is an important component of the Peterbilt 379 AC system. It helps regulate the amount of refrigerant that is released into the evaporator, which in turn helps control the temperature and humidity levels of the air inside the vehicle. The expansion valve is located under the hood and inside the cab of the Peterbilt 379. It is typically located near the compressor, condenser and evaporator.

In order to identify the expansion valve one must first locate it. This can be done by visually inspecting all parts of the AC system and looking for a small metallic cylinder with two metal lines connected to it. Once located, it can be identified as an expansion valve due to its shape and size.

Replacing the Expansion Valve

Once you have identified and located your expansion valve it is time to replace it if needed. Replacing an expansion valve can be a complex process that requires some knowledge of automotive systems so it is important to make sure you are comfortable with this type of repair before attempting it yourself.

In order to replace your expansion valve on a Peterbilt 379, you will need several tools such as metric wrenches and socket sets, screwdrivers, sealants and refrigerant as well as replacement parts for your AC system such as an expansion valve itself.

Once you have all of these items in hand, follow these steps:

1) Begin by removing any obstructions that may be blocking access to your AC system such as covers or panels.

2) Disconnect any power sources such as battery cables or wires that may be connected to your AC system components in order to prevent any electrical shocks from occurring during repairs.

3) Locate and remove any mounting bolts or clips that are holding your old expansion valve in place before attempting to remove it from its mounting bracket.

4) Once removed, install your new expansion valve into its mounting bracket by following all instructions carefully included with replacement parts or provided by manufacturers manual. Make sure not to over-tighten bolts or screws during installation process as this could damage your new part or cause leakage issues later on down the road.

5) Reconnect all power sources back into their respective locations before continuing with repairs on other components of your AC system such as seals or gaskets if necessary.

6) After reconnecting all power sources you may now proceed with replacing any remaining components such as seals, gaskets and refrigerant levels if needed for proper operation of your AC system after completing repairs on your old expansion valve.

7) Test out new parts before putting everything back together once again and re-installing any covers or panels that were removed during repairs process for safety reasons before taking vehicle out on open roads again for use!

Purchase Parts for Peterbilt 379 Ac System Replacement

When shopping for replacement parts for your Peterbilt 379 AC system make sure only to purchase parts from reliable suppliers who carry genuine OEM (Original Equipment Manufacturer) products that are made specifically for use in vehicles like yours! Doing so will ensure quality performance out of new parts installed onto vehicle ensuring proper operation at all times! Additionally look into buying sealants, gaskets and other materials needed when replacing various components within an automotive AC system while shopping around which can help save time when performing repairs yourself at home instead of having going through costly repair shops!

Preparing For Peterbilt 379 AC System Replacement

Replacing the expansion valve on a Peterbilt 379 AC system requires careful preparation, including diagnosing the problem, gathering the necessary tools and parts, and planning the task ahead of time. Before beginning work, it is important to understand the components of the system and their role in cooling. This includes understanding where the expansion valve is located and how it affects overall cooling performance.

Instruction For Replacing Peterbilt 379 AC System

The first step in replacing the expansion valve on a Peterbilt 379 AC system is to remove any parts that may be blocking access to the valve. Depending on your truck’s model, this may include removing components such as air filters, air conditioning lines, or other related parts. After all parts are removed, installation of the new expansion valve can begin. This process involves connecting hoses to the appropriate fittings and ensuring that all connections are secure before finally bolting on the new part. It is important to follow all instructions provided by the manufacturer when replacing an expansion valve on a Peterbilt 379 AC system.

Benefits of Replacing Expansion Valve in Peterbilt 379 AC System

Replacing an expansion valve in a Peterbilt 379 AC system can provide several benefits for improved cooling performance. The new part will allow for more efficient exchange of refrigerant between evaporator and condenser coils which can help improve overall cooling ability. Additionally, replacing an old or worn-out expansion valve can also help enhance compressor performance since it helps reduce pressure drop across its valves which can reduce strain on other components in the system such as condensers or compressors.

Tips for Working with a Peterbilt 379 AC System

When working with a Peterbilt 379 AC system it is important to exercise safety precautions at all times during installation or replacement work. Additionally, planning tasks ahead of time will help ensure that all necessary tools and parts are gathered before beginning work so that no mistakes are made while performing maintenance or repairs on this type of system. Taking these steps will help ensure that replacement or maintenance work goes smoothly and efficiently without any delays due to improper preparation or lack of knowledge about how this type of system works.

FAQ & Answers

Q: Where is the expansion valve located on a Peterbilt 379?
A: The expansion valve for the Peterbilt 379 is typically located either under the hood or inside the cab.

Q: What tools are needed to replace a Peterbilt 379 expansion valve?
A: You will need metric wrenches and socket sets, as well as screwdrivers in order to replace the expansion valve.

Q: What parts are needed to replace a Peterbilt 379 AC system?
A: You will need an expansion valve, sealants, and refrigerant in order to properly replace a Peterbilt 379 AC system.

Q: What preparation is necessary before replacing a Peterbilt 379 AC system?
A: Before replacing a Peterbilt 379 AC system, it is important to diagnose the problem, as well as gather all of the necessary tools and parts.

Q: What are some benefits of replacing an expansion valve in a Peterbilt 379 AC system?
A: Replacing an expansion valve in a Peterbilt 379 AC system can improve cooling abilities, as well as enhance compressor performance.

The Peterbilt 379 AC Expansion Valve is typically located on the firewall, right behind the evaporator. This provides easier access to the valve and prevents it from being damaged while servicing or replacing other components. It is important to keep this valve in good condition in order to ensure proper air conditioning performance.