What is an expansion valve (orifice tube) replacement?
Refrigerant is the lifeblood of your car’s air conditioning unit. The expansion valve or orifice tube controls the pressure and amount of refrigerant entering the evaporator. An expansion valve (or orifice tube) replacement involves removing the valve and installing a new one.
When should I replace the expansion valve in my car?
The expansion valve converts refrigerant from liquid to gas for use in the evaporator core. Without a properly functioning expansion valve, your car’s air conditioner will begin to malfunction.
A broken valve could cause too much refrigerant to flood the system, causing the AC unit to freeze, but not emit cold air. At the other extreme, too little refrigerant will cause the condenser to simply stop working, resulting in a cabin full of hot air.
How long does an AC expansion valve last?
There is no generally-accepted life expectancy for a car expansion valve or orifice tube. It should last for the lifetime of the car, but it can be affected by wear and tear over time. You will probably have to replace your expansion valve at some point if you live in a hotter climate, especially if you don’t take your car in for routine maintenance.
Is it easy to replace a car expansion valve yourself?
Replacing an AC orifice tube isn’t a great DIY project. It requires specialist equipment to evacuate and replace the refrigerant in the lines, and it could be dangerous. The refrigerant in your car is toxic, flammable, and corrosive. If it gets contaminated before it gets back in the lines, it could affect other parts of the cooling system.