Does your car air-con huff lesser air than you need? Or does it blow too much than you want? If you're experiencing any of the two, then you should check your air-conditioning system right away. These symptoms might lead to a faulty a/c expansion valve. Here are a few items you should consider before you replace your a/c expansion valve.
The two types of a/c expansion valves
A/c expansion valves are also called thermal expansion valves. There are two common types found in the market today, the o-ring type and the block type. Listed below are short descriptions of their functions and some pros and cons.
- O-ring a/c expansion valve
- A/c expansion block valve
This type of valve has 2 passages; one from the filter drier and the other to the evaporator inlet. An advantage of this type is its ability to determine temperature and pressure. It can also regulate refrigerant flow efficiently. However, it may be prone to corrosion and that will lead to malfunction.
Unlike the previous type, the block valve has 4 passages. It has the same connections like the o-ring, but additional exit point to the compressor and an entry point from the evaporator are added. This valve type consists of small parts, and if it's not taken care of properly, these small parts may cause clogging from the inside.
Both types of a/c expansion valves regulate air flow from the refrigerant efficiently. With regards to their lifespan, it is advisable to choose trusted brands because most of them offer 1-year warranty to the part.
Pinning down the perfect type for your car
Now that you have an idea about the two types of an a/c expansion valve, you're a step closer in searching for the right replacement. Here are some tips to make your search more accurate:
- List down the make, model, and year of your car, so your search will become easier. Key these in when you visit aftermarket websites because they can easily locate the part using these data.
- You may also compare your current a/c expansion valve to the item description on the website's catalog.