Be sure to only use oil meant for vacuum pumps. Using other mechanical oils could impact the quality and performance of your vacuum.
Make sure the gauges and gauge hoses are connected tightly. Loose seals can compromise your vacuum. In your car, your high-pressure port will generally be physically higher than the low-pressure port. [3] X Research source
If you are trying to start the pump in cold weather, open the intake ports until the pump reaches normal running speed. Then, close it off again. [6] X Research source
If you are unsure which way you need to turn your valves to open them, check the manual that came with your gauges or vacuum.
Generally, you want to let your vacuum run for at least long enough to get the measurement below 1,000 microns. If you can, try to get it down to 500 microns.
If it’s not able to hold for that long, you likely have a leak and may need to replace components on your vacuum pump.
If you have a drain issue, one of the most common problems in air conditioning, you can get a Co2 drain gun and an AC drain brush to clean the clog in the drainage system. It is better than using chemicals. [12] X Research source You should also replace filters regularly. It will help prevent clogs and debris collection on the bottom of the condensate drain pan. You can even get condensate pan tablets to prevent drain clogs. [13] X Research source
