Squealing AC compressor

bumping for u OP

>>17394552
Most modern PCMs can tell you if the A/C compressor is engaged or not. If it's only noisy when it's engaged, then it's the compressor clutch.

Also if it was completely out of coolant, you need to pull a vacuum before recharging it again.

The compressor is probably dry after not being ran for a long while. It needs to be taken apart, cleaned and greased.

Don't expect to fix AC by merely adding refrigerant. It's supposed to be a closed system and cannot work otherwise. Fix the leak that cost you your previous refrigerant, and replace the dehydrator. Then it might work again.

>>17394552
idler pulley.

>>17394561
bless anon

>>17394563
hmm you make a good point, perhaps air leaked in when the system reached atm. But would that cause squealing?

I am thinking maybe I pumped in too much refrigerant and liquid has condensed. When I move the compressor it almost sounds like liquid is sloshing around. Is this the oil or something bad?

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OP here. Just bought a manifold gauge and vacuum pump.

Can't run the ac because of the squealing. But at idle, I get 30psi low pressure, similar on high pressure side.

Does this rule out refrigerant overcharge?

>>17394552
While the clutch is engaged, pour water over the belt. If the squealing goes away, it's the belt.

>>17394563
Some belts won't squeal at idle, typically flat rib belts, because the added load will cause slippage.

Is your alternator also on the same belt?

Sometimes it's the alternator pulley because using the A/C puts load on the alternator, too.

It could also be that the tension is off on the belt or that one of the tensioner/idler pulleys is going bad.

Or, maybe something like coolant or oil has leaked onto the belt, causing slippage under load.

Compressor is fucked from being contaminated when you didn't vac the system down properly. You've fucked the whole job

>>17394552
Likley compressor clutch bearings are fucked.

>>17395326
This. that cheap shit in the can usually has some kind of sealant which will duck up your compressor.