Modern Tire Dealer

APR 2017

Magazine for the professional tire industry

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33 the service port valve and let air into the system, contaminat- ing the system with air. Of course this will never happen in Florida, but sometimes it does happen up North, so the new service port caps have an O-ring to seal the cap to the port. e O-ring not only keeps air out, it also keeps the port clean inside, protecting the valve from debris that can cause a slow leak by preventing it from seating properly aer service. e cap is supposed to be tethered to the port so it doesn't get lost when removed, but some car models have been sold without tethered caps. New caps with a tether are available as replacement parts. Finally, the new A/C systems are fied with a redesigned evaporator that's stronger and less likely to leak. at doesn't mean you shouldn't check it for leaks, but if you replace one, make sure the package or tag on the new part indicates that it meets the new SAE J2842 standard. Refrigerant flammability Some service port caps have an icon on the top indicating the refrigerant is flammable. The flammability issue has aracted a lot of aention, prompting the industry to conduct some serious third-party testing. e boom line is this: e refrigerant will burn, but it takes a lot of heat to ignite it and it burns slowly. Almost every other fluid under the hood An inline heat exchanger (IHX) has concentric inner and outer chambers. Liquid refrigerant from the condenser flows through the main inside chamber, and the outside chamber surrounds it with vapor from the evaporator. Photo courtesy of Eaton Corp. The service port caps are supposed to be tethered to avoid loss during service. You will note the caps on this 2017 Chevrolet Malibu don't have tethers, but they do have an O-ring inside to keep the service port clean. Quik-Link: 800-687-1557 ext. 14117

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