99 E39 AC Problem

Hi,
1999 528i here.
Two weeks ago the AC compressor took a dump.
Had my local mechanic replace the compressor, drier and valve.
Now the AC works but not very well.
Took it back and he verified the freon level was good. He tested for leaks and could not find any.
Before the original compressor went bad, I could keep the temp at 68 and worked great. Froze me out.
Now, I have to turn it down to like 64 to get any decent cold air coming through. But it's struggling to cool, and certainly not 64!
In addition, the AUTO function is not working. Using manual settings I can turn the fans up pretty high. But as soon I select Auto the fans go to a really low setting and never move from there. Even on the manual setting the fans don't seem as strong as it used to be.
Do you think this is the final stage resistor?
One other thing, I think the fan clutch might be on it's way out. It's working but starting to sound like an air-raid siren in the background.
Any suggestions appreciated!
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Are you sure it was not a sensor problem all along?

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New compressor or rebuilt? Did he install the specified Freon or one of the new replacements?

What pressures did he see on high and low eides? The pressures tell you more than the level.

Doesn't matter how low you turn it, either the compressor is on or it is off. Once you turn it down low enough to turn the compressor on, it is on.

It's not the usual failure.

Fan clutch where? Do you mean the internal AC fan? It has no clutch. If it is squealing, put some light oil on the bearing and see if it frees up. Ultimately the solution is replacement but it's a pain. --scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

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snipped-for-privacy@panix.com (Scott Dorsey) wrote in wrote:

New Compressor, from eBay (I know.....)

Don't know

The compressor goes on when I turn it on, but cold air won't come out until I turn it down to around 65

Not the AC fan, the main fan in the front of the car. Comes on and off when AC is on.

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Okay, find that out before anything else.

There is no connection between the fan and the AC... so if you are hearing a squealing with the AC on, it's either the compressor or the belt driving it. That needs to be fixed.
You have a viscoelastic clutch; I can see how it could possibly make sounds if it was damaged but the normal failure mode is just for it to slip and the fan to stop turning silently. --scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

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snipped-for-privacy@panix.com (Scott Dorsey) wrote:

What do you mean? R12 hasn't been used in cars since 1994.
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