I know i need to add more R-134a to my A/c system, because during the day time my A/c cant cool my car like it use to.

Now, i want to know how much would I actually need to add, i dont have a gauge. Someone told me that I can jus hook up the line to the lower service line and let the freon in....and as soon as the lower service line gets really cold, that would be enough?

anyone heard of this b4?

 

I would invest in a charging gauge. They only run $20-30, and improperly charging the system won't help your AC at all.

 

go to Wal-Mart and get the a/c recharge cans that come with the hose and gauge attached to it. follow the instructions and you should be good to go. Good Luck

 

Hmmm, it won't let me vote twice, I was gonna have some fun adding more choices to the poll...

A good guage set lets you measure BOTH high & low sides, because if the system is plugged the high side will be too high & the low side will be too low. If that's the case, adding refrigerant will make it worse.