Audi A/C Condenser - Denso 4770787

Product Information

The A/C condenser is effectively a radiator for your vehicle's A/C system, designed to vent heat from the air conditioner's refrigerant. The A/C condenser is usually mounted to or near the main radiator in the front of the vehicle. Its function is to cool the high-pressure hot gas refrigerant coming from the compressor, condensing it back into a liquid. The cooled liquid leaves the condenser and flows through the A/C receiver drier on its way to the evaporator, where the evaporation process provides cool air to the cabin. A/C condensers are typically made completely out of aluminum and are fairly lightweight and delicate. Both sides of the A/C condenser are connected to the high and low-pressure pipes using bolted fittings and O-rings. Due to the high-pressure nature of the A/C system, even the most minor leak can cause complete A/C failure.

The most common reason for failure in A/C Condensers is from road debris, such as rocks or dirt, which causes punctures or bent fins. A punctured condenser will vent the refrigerant in the system, usually 134a, fairly quickly leading to immediate failure. Bent fins will not typically lead to condenser failure, but will reduce the effective cooling capacity due to reduced airflow.

Internal blockage is another common failure mode, mostly in older or higher-mileage vehicles that have not had regular A/C services. A blockage is usually caused by internal corrosion as a result of water accumulation in the system. The corrosion grows and clogs the narrow passages, leading to reduced efficiency and sometimes even cracks and leaks. Leaks can be hard to find, especially when the A/C condenser is peppered from thousands of miles of highway exposure. The best way to find a leak in your A/C system is to charge it with an oil containing reactive UV dye after a thorough engine bay cleaning, and running the air conditioning. If there is a leak, it will be easily viewed using a UV (black light) flashlight as a bright neon reflection.

• Internal blockage: If the A/C system is rarely or never serviced, the A/C receiver drier will become saturated and allow water that has made it into the system to circulate along with the refrigerant. Water and R134a combine to create a corrosive acid, which causes corrosion buildup in the narrow passageways of the A/C condenser and evaporator, reducing efficiency and sometimes causing the A/C to stop working altogether.
• External impact damage: The A/C Condenser is a lightweight aluminum assembly positioned right in the front of the car. It’s common to take a beating with prolonged high-speed miles, especially in the winter when the area uses rock salt on the roads. Even a pinhole leak is enough to eventually empty the A/C system, and leaks will not be readily identifiable without A/C dye.

About Denso

Denso has taken everything learned from being an OEM manufacturer and applied it to their aftermarket product line. Every component that Denso manufactures and distributes in their factories has been designed with precision and always manufactured to OEM specifications and subjected to rigorous safety and performance tests to stand up to all driving conditions.

All of Denso's factories are ISO and TS16969 certified worldwide which is just one of the many reasons Denso has zero defects for parts produced in the millions. Denso was a recipient of the prestigious Deming Award for quality and they've spent over five decades perfecting their technology and processes. The Original Equipment standard quality and reliability of DENSO aftermarket parts add up to a tremendous value for their customer and FCP is proud to be a supplier of Denso replacement automotive parts.