What is an automotive ac evaporator?
Your car air conditioning AC evaporator is a heat exchanger that resembles the condenser but is much smaller. They are generally of the tube and fin design. The evaporator, also sometimes referred to as the evaporator core, is one of the two (maybe three) heat exchangers in a mobile A/C system. In a typical passenger car or pickup truck, the evaporator is usually located inside the passenger compartment, quite often deeply buried in or under the instrument panel.
Some vehicles, usually vans or SUVs, have two evaporators; one under the instrument panel, or elsewhere at the front of the vehicle, and another one located in or toward the rear of the vehicle. The rear evaporator is often located behind a side panel or in the ceiling above the rear passengers.
How does an auto ac evaporator work?
Inside the evaporator, the pressure of the refrigerant is allowed to decrease from the high pressure of the liquid refrigerant to very low pressure. This pressure change inside the evaporator causes the refrigerant to boil, or evaporate.
The latent heat of absorption from this state change makes the evaporator cold and allows it to pick up excess heat from the outside air or re-circulated air before it reaches the passenger compartment. If you want a more in-depth understanding of your ac/system read our article on how your car air conditioning works.
Comparing the A/C Evaporator to the Heater Core
The heater core in a vehicle transfers heat from the engine to the cabin, but the A/C evaporator works in a reverse manner, transferring warm air out of the vehicle, and then cooling it down and sending it back through. There are similarities in the two components, and each needs a series of heating and cooling system components to work properly.
What are the main causes of an A/C Evaporator core failure?
There can be quite a number of reasons why your evaporator will failure, such as leaks, internal damage, faulty ac components etc. Below are the 3 common causes that can cause your vehicle a/c evaporator to fail.
There are several reasons why a leak occurs. In most cases, a seam or weld has gone bad.
This often happens because leaves or other organic material enter the evaporator case through the exterior air intake vents and come in contact with the evaporator’s surface, this moisture surface and decomposition of organic materials can form corrosive substances which could eventually damage the evaporator core.
The evaporator fins are also susceptible to clogging from leaves or hair from pets and other outside road debris. The only true permanent fix for a leaking evaporator core is the replacement of the component.
Replacement & installation
Properly evacuate the a/c system making sure there are no positive pressure readings on gauges before doing any repair to the ac system. The procedure for removal and replacement of the evaporator core is different for every car make, model and year. In most cases, the removal of the entire dashboard is needed to get access to the HVAC evaporator case.
Cost of a Car A/C Evaporator Core Replacement Service
The cost will depend on the type of car make, model and year you drive. Jack Frost provide both mobile and shop car air conditioning repair services which means our technicians can come to your home or office, or you can bring your vehicle to our Mt Gravatt workshop to have your evaporator replaced.
Serving customers for over 20 years, Jack Frost mission has always been to deliver customer satisfaction providing quality services at affordable prices. Rest assured Our Technicians are trained to the highest level, so they can offer the best quality service and advice.
To request a quote for all car air conditioning repair needs, simply fill out the quote form on this page or to request an appointment head to our contact us page.
Alternatively, you can call our office on 1300 376 789 or visit our Brisbane workshop located at 4/429 Creek Road, Mount Gravatt East.
Our office hours are Monday-Friday 8:00 am to 4:00 pm.