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Greetings and welcome to just answer!!!!!
Is the ac cooling ok?
it is actually pretty good
Does the ac clutch kick on and off rapidly or stay on then goes off?
i want to be sure i don't do any harm. the car is pretty old 135K miles and it has worked great all these years
it cycles on and off. i have not noticed it kicking on/off quickly
I see. If it is not kicking on and off rapidly then I would leave it alone for now. R134a has some bubbles in the site glass, so that is normal. If you want to be sure have a shop hook up the ac gauges and see what the pressure are. Just topping it off can put to much in to the system and then could cause some damage.
the adder can of freon came with gauges and last year the pressure was ok but it still took one can to stop the bubbles
so do you say leave the bubbles and use it?
That is only reading the low side though. You can have high pressure and never even know it until it has already caused damage. If the system works I would leave it alone.
how will I know when to do something? and do you think i can do it myself or does it have to go to the mechanic?
The system will stop cooling as well. There is built in fail safes that will not allow the compressor to turn on when it gets too low or too high. I would have the mechanic evacuate and recharge with the correct amount of R134a to be sure it is correct, because then you will not damage the system.
thank you for the clear answer to my question