You need to test the low side pressure with the compressor on, engine at
cruising RPM (around 2,000 RPM). You've got it undercharged right now if
it's running 27 psi @ idle.
On a 65* day, you'll want her running 27-30 psi @ 2k RPM, which will put you
at 40psi or so @ idle.
I kinda figured it was low, but the instructions didn't say anything
about the compressor. I didn't feel like asking the moron at the shop
who vac'd it out... the dipshit took out my shraeder valves and told
me the adapters had valves in it... golly gee wonder what the hissing
sound is while the machine was running.. anywhoo.... it's nice to
have AC again esp heading back south.
You might also consider adjusting the low pressure cutout switch to a lower pressure to get colder air. Depending on your rig.
A great forum for A/C is http://ackits.com . They have helped me tremendously in the past.
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