![]() ![]() This is especially true after servicing the system. It.Īs I stated earlier, the most common place for the AC system to leak is at the service fittings. ![]() With the latest and most innovated infrared sensor, its sensor life extends enormously for a maximum of 10 years. Close your service ports, remove your gauges, and go for a nice cool drive. If I’m getting a 30º to 40º F drop, I consider that good. One last test is to check the vent temperatures when filling the system. Most manufacturers don’t give exact readings but rather a chart that shows approximate readings under different temperature and humidity conditions. Your readings will vary a great deal depending on the heat load to the AC system. Generally on a 134a system you want to see low pressure readings near 20 – 30 psi and high pressure readings between 200 – 300 psi. This takes some experience, however, because the pressures will vary depending on ambient temperature and humidity. You can also use the pressure gauges to see when you’ve installed enough refrigerant. Look for a sticker under the hood that tells you how much refrigerant to put in. As for how much goes in the vehicle, that depends. You can look at the outside of your refrigerant supply and see how much is in the can. If you’re unsure for your specific vehicle, I would recommend asking in the Forum.Ī/C Manifold Test Kit 50″ long hose High quality brass fittings 0-120psi low side 0-500psi high side Comes with a.Ī refrigerant charge is measured by weight. Normally the fittings are also different on the high/low sides to help facilitate this. This helps draw in the refrigerant and prevents damage to the compressor. You only add refrigerant to the low side of the AC system. If the system is able to hold vacuum for at least 30 minutes, you’re ready to start adding refrigerant.Ī common question I get is: “ Do you add refrigerant to the high or low side?” Vacuuming out the air in the system is the best way to remove this moisture and ensure the system is intact and ready to accept a refrigerate charge. EVAC AND RECHARGE AC FREEThe AC system must be free of moisture in order to operate efficiently. Moisture is always present in the air, especially humid air. In addition to testing the system, putting a vacuum on it also helps remove any moisture that might be left over from when the system was open to the atmosphere. Be sure to check the service fittings, as this is a common leak point. Find and repair the leak, then pull a vacuum on the system to see if it’s been repaired. ![]() If it can’t reach that level, you likely have a leak somewhere. The system should be able to draw about 29inhg when under vacuum. This way, you avoid wasting refrigerant on a leaking system. This is a great test to perform before you commit to adding refrigerant. If the system can’t hold a vacuum, it certainly can’t hold pressure. If the system still has a leak, it will begin to loose vacuum. I then recommend you let the system sit for another 30 minutes while you watch the gauges. You do this by hooking a vacuum pump up to the system and letting it draw the air out of the system for about 30 minutes. The first step is to evacuate the system. Easy to use #1 rated coldest air Cools your vehicle’s interior faster with colder, drier air Replaces lost refrigerant and. ![]()
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