Tech Tip: J2788 Test Equipment Needed to Diagnose and Recharge Today's A/C Units

Tech Tip: J2788 Test Equipment Needed to Diagnose and Recharge Today’s A/C Units

In order to remove all the refrigerant from later-model vehicles during the recovery process, a J2788-compliant A/C machine is required. This is due to later-model vehicles using less refrigerant, which older A/C machines cannot fully recover, leading to potential problems.

In order to remove all the refrigerant from later-model vehicles during the recovery process, a J2788-compliant A/C machine is required.  This is due to later-model vehicles using less refrigerant, which older A/C machines cannot fully recover, leading to potential problems.

For example, if an older A/C machine leaves behind 30 percent of the refrigerant after a Recovery, Vacuum, Hold and Recharge, and one then performs a full charge, the A/C system  becomes overcharged, which will cause performance issues and cause premature component failure.

Machines such as the Bosch ACS-615 are designed to exceed the J2788 standard, consistently recovering the maxium old refrigerant, preparing the A/C system for recharging.

If a shop already has a J2788-compliant machine, make sure it is ready for hot weather A/C service by changing the vacuum pump oil, keeping a spare filter on hand, and keeping the tires properly inflated. Underinflated tires can cause the refrigerant scale to be out-of-calibration — not an issue with machines which use foam filled tires, such as the Bosch ACS-615.

Other tips include:
• Use a refrigerant identifier and check virgin cans of refrigerant. A mixture of 134a and R22 can damage J2788 machines.
• Check for sealant leaks. Sealants can kill the A/C machine. (a very inexpensive sealant tester is available from Neutronics).
• Use a filtration system to handle vehicles with traces of seal. Keep in mind that you need to open the cleanout drain after every service to measure the amount of oil removed. (AirSept offers an inline filtration system called RecycleGuard. These filters are quickly installed inline and remove sealant, dye and lubrication).

There is also a new standard for leak detectors: J2791, and current equipment is certified to catch leaks as small as a 1/4 ounce. The companies making these detectors are also required to tell you about chemicals that provide a false positive.

In addition, some A/C repair issues cannot be resolved without reprogramming the vehicle’s computer system. On that note, it’s always a good idea to take some refresher courses to get up-to-date with the latest diagnostic techniques for air conditioning weather.

Bosch is a proud supporter of the Automotive Aftermarket Suppliers Association’s Know Your Parts education and awareness campaign. This initiative promotes the importance of quality brand name aftermarket parts backed by full service suppliers, and its impact on delivering reliable products to today’s motorists. For more information visit: http://kyp.aftermarketsuppliers.org.

Source: Bosch Diagnostics Business Unit    
www.boschdiagnostics.com

You May Also Like

Mitchell 1, ASE Present 2022 Technician of the Future Award

Nathanial “Nate” Nie of Mission Viejo, California, was named the 2022 Mitchell 1 / National Institute for ASE Technician of the Future.

Nathanial “Nate” Nie of Mission Viejo, California, was named the 2022 Mitchell 1 / National Institute for Automotive Service Excellence (ASE) Technician of the Future during the ASE Board of Governors Meeting and Technician Awards banquet held recently in San Diego, California.

“We congratulate Nate on being named the 2022 Technician of the Future,” said Nick DiVerde, senior marketing director, Mitchell 1. “His accomplishments thus far have demonstrated his commitment to excelling as an automotive technician and we know he will continue to be successful as he journeys down his career path.”

Schaeffler Group Releases Series of LuK TSBs

In conjunction with its REPXPERT service brand, Schaeffler provides technical tips and service information for LuK products.

GB Remanufacturing Releases 2022 Year in Review

The GB Reman 2022 Year in Review is available for download.

Survey Shows Greater Trust in Service Professionals

More than 70% reported increased levels of trust in repair shops and/or service technicians.

SMP Closes the Year with 214 New Part Numbers

SMP says it is committed to providing replacement parts for hybrids and EVs through its Standard and Four Seasons brands.

Other Posts

NRS Brakes Adds 18 New Part Numbers for Multiple Models

According to NRS, these additions cover around 11.7 million vehicles.

ASE Offering Options for Testing and Recertification

ASE offers three testing options for service pros – in-person testing; the ASE renewal app; and ProProctor remote testing.

Bosch Releases Hydro-Boost Power Brake Assemblies

Hydro-Boost Power Brake Assembly now available to independent repair shops and DIY’ers.

Akebono Expands EURO Ultra-Premium Disc Brake Pad Kits

Company increases coverage by over 640,000 vehicles.