95 k1500

The only work I did was to replace the compressor. The instructions that came in the box said that there was oil in the compressor. I drove the truck this morning approx. 50 miles on a round trip and the only issue I found was braking to a stop (from 10 down to 5 mph) there was a sound like an airplane turbine powering down (if that makes sense) Is it possible that there is a break-in period for this type of part that I am not aware of? The noise seemed to be more prominent yesterday especially when the truck was idling in gear and idling in park.

thank you

The receipt says that I was billed for was evacuate & recharge a/c system and for 2lbs of R134a refrigerant. I would hope they'd remember to add some oil to the system, especially after vacuuming everything out. The only sticker that is on the truck is on top of the accumulator. It says to use #12345922 or equivalent synthetic oil and 2.0 lbs of R134a refrigerant or the system will be damaged. I will have to call on Monday to get some more details about what was done. I didn't take it to a dealership to have this service work done. I took it to a Goodyear service center about a mile down the road. Thanks for the reply

I have a 1995 K1500 with a 5.7 A couple of years ago, the bearings in my ac compressor went to pot. I (stupidly) bought a used compressor and had it put on my truck. The bearings were fine, but the seals were bad and it wouldn't hold charge. Fast forward to yesterday, I bought a new compressor from Autozone and, since the system had no charge, I replaced the compressor myself and this morning took it to a shop to have the system vacuumed and recharged. When I got the truck back, the air is ice cold, however there is an incredibly loud hum in the cab of the truck when the air is running and the truck is at idle. At speed, everything is fine, but coming to a stop at a light 5-10 mph) or sitting at idle causes the noise. I popped the hood and had my wife press the button to engage the a/c. The clutch engages and the noise starts. Any thoughts on what the problem could be? Would the system be charged to too high of pressure? I am really hoping it isn't the compressor because I'm not really in the mood to remove it again