With a Halogen electronic leak detector.
You can find a Freon leak in a home Ac unit by using a leak detector. These instruments are capable of detecting trace amounts of Freon and pinpoint leaks.
You have to have a freon leak detector. Are you can put freon dye in the system and find a leak that way.
Ac leaks are hard to find. there is a chemical that can be added to the Freon. Under a special light it will show up. If it is a small leak it may not show up, especially if its on the compressor behind the clutch.
most likely low on freon. while driving the ac compressor spins faster so it might cool better with low freon at higher engine rpm. have your system charged and checked for leaks.
There probably is a leak. Is there still freon in it? There are ares in the a/c system that are not visable. Was Dye added?
If it leaks it leaks. Central units are self contained with no external rotating shaft seals to leak. If the tech came out and added freon without detectng the leak, either he did exactly what you directed, or he is a BS artist hoping for a repeat job.
Never. A properly operating AC unit will have no leaks, thus never need recharging.
Find the low side ac port on the 1999 DeVille and connect an ac gauge and freon tank. Start the engine, turn the ac on high, and open the freon valve. Let the freon flow until the gauge reads full.
Yes! Freon leaks out during the winter months!
how do you check freon on central ac and what should the guages read.
R134a, as do all vehicles for that MY
The Freon probably needs to be recharged. Any repair shop should be able to do this. They should also test the system for leaks to see why the Freon leaked out to begin with.