Auto Service Professional

APR 2018

Magazine for the auto service professional

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Page 39 of 61

38 | ASP April 2018 Technical and increase your A/C work while doing the customer a favor, alerting them to the need for service. Considering the average profit for a recharge is about $70, quick-check technology like this can easily bolster you're A/C work. Identifier hose oil contamination Oil from refrigerant systems is considered a serious contaminant of refrigerant identifiers. is contamination will damage the internal sensitive electronic components in the identi- fier and must be avoided. ere are several known truck A/C systems with a unique low side service point design which have a greater potential to introduce excessive oil into the identifier sample hose. Any vehicle with an under-cab low side refrigerant service port such as those found on 2002 and newer 5000 and 9000 series trucks have this heightened risk. If refrigerant identification is conducted on these vehicles, the sample hose must be inspected for oil contamination. A reported air concentration higher than 10% could also be an indication of oil contamination. If oil contamination is present, do not continue to test A/C systems. e sample identification hose must be replaced. Frequently asked questions Mahle Service Solutions shared a few com- monly asked questions regarding recovery/ recharging machine operation. Q: Why does my machine shut off or work really slow when I try to fill the internal cylinder from an auxiliary cylinder of clean refrigerant? A. e auxiliary cylinder will cool due to the vaporization of refrigerant. is causes the pressure to decrease. Place the auxiliary cylinder in a bucket of hot water or use a heat belt (available from RTI) to increase the speed of recycling. Q: Why won't the compressor come on but the low side gauge has pressure showing? A. Check the purge gauge (contamina- tion monitor) and make sure the pressure is correct for the ambient temperature. If not, refer to the operation manual for instructions on how to purge the unit or call tech support. Q: Why won't the machine do a fill during the fill cylinder process? A: ere are two reasons why this might be happening. e first reason is that the yellow hose may not be connected properly. Make sure that the anti-blowback valve is connected to the fill cylinder port and not to the external tank of refrigerant. e second reason that would cause the fill cylinder process not to work is that the inter- nal tank pressure is greater than the external tank pressure. To overcome this situation, try placing a heat belt on the external tank, or put the external tank into a bucket of warm water. e heat will create a higher pressure, which will help the refrigerant go into the internal tank. If there is no access to a heat belt or warm water, then recycle the refrigerant into the machine. Q: Why won't my A/C recycling machine pull into a deep vacuum? A: e A/C recycling machine must first shut off in a vacuum and hold the vacuum for at least two minutes during the recovery mode. e vacuum process will not run until this happens due to a low pressure switch in the unit not being activated. Turn the A/C recycling machine to the recycle mode and allow it to pull down and shut off automatically if the low side gauge indicates a positive pressure or is at zero. Make sure the vacuum is stable for two minutes and then start the deep vacuum. ■ Tracerline's TP-8692 UV multi-colored fluid dye kit TP-8692 includes three color-coded dyes for petroleum and synthetic based fluids. Photo courtesy of Tracer Product s

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