It is very difficult to diagnose a sound without actually hearing it. A
click when the compressor engages is normal. if you are hearing something
other than that, I recommend that you have the car looked at by a competent
technician for diagnosis.
The cycling I don't care about, I just want to know if it is normal to
cycle that often. The noise doesn't bother me either (this is a 10
year old car), I just would like to know if it means it's going to
fail soon or not.
The sight glass is on top of the receiver/drier. The receiver/drier is a
cylindrical canister, usually silver or black mounted vertically in front of
the radiator. The receiver/drier will have metal refrigerant tubing going
into and out of the top, along with the sight glass, which is a small
circular glass window about the size of the nail on your little finger. If
you look at the sight glass when the AC in on, it should look like water is
flowing past the glass, with very few bubbles. If you can see what looks
like foam flowing past the sight glass, then there is air in the system and
so the refrigerant needs to be recharged.
Might add that it is very important to see those bubbles when the compressor
cycles off. If you don't it is overcharged.
Here is your answer though. "The ac works fairly well I have to say"
Don't fix something that's not broke. Just make sure nothings falling off or
reducing the air flow to the coil in front of your
A common problem is leaves and stuff building up between the radiator and
condenser because its easy to miss.
compressors in auto's are big pumps. Maybe even bigger than the one in your
home. Arizona is smoking HOT too.
When your system cycles on a 110f degree day it will be much more noticeable
(probably feel it too) than it would if the ambient
temp was say 80f degree.
Imagine something like 6 - 10 cubic inch's worth of compressor and maybe 300 psi
out there in that 120d desert heat and its easy to
see were the noise comes from.
some types of compressors are just noisy too like those 2 cylinder CCI pumps.
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