Greetings! I have a 2000 Chevy Suburban 1500. The model p...

Greetings! I have a 2000 Chevy Suburban 1500. The model probably doesn't matter much to this issue, as it's about the A/C system. The A/C compressor went out. We got the new ACDelco replacement, swapped it out, pulled vacuum, and ...

Greetings! I have a 2000 Chevy Suburban 1500. The model probably doesn't matter much to this issue, as it's about the A/C system. The A/C compressor went out. We got the new ACDelco replacement, swapped it out, pulled vacuum, and filled it up to specs (maybe just barely past spec). It cools perfectly now. The problem is that I occasionally hear a hammering sound when the car turns on with the fan engaged. I first heard it immediately after the replacement process Mechanic's Assistant: Have you checked the Freon level? There's no indicator, but I suspected a slight overfill of refrigerant when it first happened. I released a bit of pressure and the noise went away. But it still comes back now and then. It's really rare (mayne 1 in 20 times I start the car), and it goes away and won't come back if I just turn off the fan for a moment Yesterday I managed to isolate the noise (hard since it's so intermittent) There's a large hammering/vibration of the line between the condenser and the receiver/dryer Mechanic's Assistant: What is the model of your '00 Chevy? Suburban 1500 LS Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far? Yes, I do all my own mechanics. So far all I have done is try to isolate where the noise/hammering is happening and released a bit of the refrigerant pressure Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? There are no leaks, and the dryer itself seems to do most of the shaking. I don't know why this piece of the A/C system would suddenly and intermittently do this. Nor do I know why it goes away with a simple off/on of the fan.