AC Refrigerant level
 

Just curious: can my little peephole be without bubbles and my refrigerant still be a little low?
I'm not quite getting the cooling that I was a few days ago and am curious as to why.

No bubbles assumes there is enough Freon to work OK. Sometimes bubbles appear as a froth.

Watch the peephole when the AC compressor starts and stops. When the Freon starts to flow bubbles will appear then disappear. Same after the Freon stops flowing

Some bubbles should appear after compressor shut off.

Check for a marked difference in temp between the compressor inlet and outlet.

If you can see any bubbles when the AC has been on for a time the coolant is too low.

A gauge set can be installed to check high and low pressure. This is another way to determine too much or little Freon.

Thanks. Just wanted to be sure.
Pulled cabin air filter out. That's the problem. I just got the car. 120k miles. I don't know if it's ever been changed. I'll have to get a new one tomorrow. I had to use AC without it today so I could be cool in the 90+ weather and Gulf Coast humidity.