a/c leak?--help!

how is it that u know the system has a charge?

if its full then theres no leak, u may have a ac cycle switch going bad or a parital block?

kinda sounds electrical. like nh351w said check the ac cycle switch i think there is two of them. if i were you i'd just take it to a pro. take all of the guessing out of the equation.

first i need to know if the reading u r getting is with compressor running or off, if the compressor is riunning your low side should be between 35psi and 45psi, if low side pulls down below 20 or 25psi the low pressure switch will cut compressor out till pressure comes up to about 50psi.

What you describe about the AC pressure sounds completely normal. When the compressor is on, you will get a pressure reading. When it's off, you will get no pressure reading.

That is why the AC recharger kit's instructions tell you to start the motor, turn AC on full blast, then check the pressure.

As far as getting no AC on really hot days, that may be completely normal too. Has this happened in the past? Have you made any significant mods since you noticed the issue (if it hasn't happened in the past)?

Here's a really easy possibility, check to make sure the AC compressor is still connected (to the electrical harnace). I forgot to hook mine up on reassembly when putting my HCI build back together, and I noticed similar simptoms as you describe (works well sometimes, but gives out, especially on hot days). I reconnected the AC compressor, and I was good to go.

Good luck.