A/C rumbling sound, works one day, but not the next

[L321]

I replaced a leaking A/C line on my 2009 Mazda B4000 last weekend, vacuumed the system and refilled. A/C worked great, drove about 20 miles and then would make a rumbling sound when the compressor kicked on and occasionally after that by still blowing cold air. The next day it didn't cool at all. I thought still had a leak at this point and just been leaving it turned off. Today I turned the A/C on and it was blowing cold air again! Drove about 20 miles and starting to get the rumbling sound again.

I am thinking I may have too much oil in the system. Would that cause this or does it sound like something else? When I replaced the line I removed the compressor and drained it and didn't get much oil at all out of it. I figured a lot of oil had been lost through the leak. The system is supposed to have 9oz of oil total. I added 4oz to the compressor, then proceeded to spill some of this out while putting it back on so added 2oz of oil into the line.

Does this sound like just too much oil blocking something and need to flush and refill or is there something else going on?

Thanks!

 

[Uncle Gump]

Rumbling... compressor coming and going

I think I would try to wiggle some connections and see if you can locate an intermittent. If ya get it going... look at the clutch... for rumbling.

You may have added more then it needed

Depending on truly how much was spilled.

There are specs to say how much to add when replacing the compressor. I believe I've even saw them in the Tech Library.

 

[L321]

Rumble may not be the right descriptive word for the sound. The first time I heard it, I thought it was a real bad exhaust leak. Sitting in the truck it sounds like it is coming from below the dash.

 

[Uncle Gump]

Clutch slip is like a metal to metal sound

The clutch does ride on a bearing... screech to grumble

If the compressor is getting liquid... they knock.