Refilled a/c now compressor groans when turned on

[twonole]

The past few months the a/c in my truck has been mediocre at best in the Florida heat. Today I went to the local parts store and bought a $30 r134a refill kit, unfortunately they all had stop leak and no other options were available :/. So anyway, I filled it up in the drive way today while it was about 91* outside so I put the whole can in til the gauge read just under 40psi with the compressor on, on the low pressure side. Now the pump was hesitant to turn on and would run for about 10 minutes straight and turn off and not come back on, so I unhooked the ground and let the computer reset. So now the a/c will cycle normally and blow ice cold but for the first 5-10 seconds the compressor is on it makes almost a groaning noise, I wonder if it could be the clutch or if I need to borrow my grandfather's manifold set and put in oil for the compressor. I'm also worried the the stop-leak may be causing it. Any help is well appreciated. I'll get a video of it up tomorrow after I get home from school.

 

[twonole]

Well I put some more freon in it about to 50 psi since it is about 90* outside and it works flawlessly and the noise is gone.

 

[Earl43P]

If it leaked refrigerant, it leaked oil too. Could account for the noise until oil got flowing.

You can find the leak by looking for soot collected on the oil, usually at a fitting or a hole in the condensor in front of the radiator.

All compressors leak from the main shaft seal. It's just a matter of "how much".
Rag off the backside of the clutch pulley and look at how much has been flung from there and look at the underside of the hood.

Do add oil the next time you service it. They sell cans that are r-134a AND oil together.

I'd also suggest you be a bit more careful with how much you add.
I use a thermometer in the center duct, mid fan speed, not Recirc, 2000 rpm and quit adding refrigerant when the temp stops dropping. That's typically in the low 40s. When you drive it, that temp should get colder. If it's warmer, you added too much.
Pretty much how the Haynes manual recommends.

 

[twonole]

Thanks for the info, that is actually where I got the info on filling the, a Haynes manual. It blows 35* F out of the center on 3/4 fan speed which is icy enough for me. I don't feel the leak was major since it took 10 years to get to the point of needing to be filled since it's the first time the a/c has ever been serviced in the life of the truck. The thing that is perplexing me is how after a while driving down the road the a/c will stop coming on for about 5min then just magically come back on. It will do it randomly, sometimes not at all. Any ideas on that?