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#1 (permalink) Old 05-15-2008, 05:48 PM
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A/C noise on 2005 325i

Hello!

Just found this site and hope I can get some answers! When the A/C in running it makes a hissing or high pitched noise, though it is not very loud. Is this just the compressor cycling? Anyone else have this noise/ Thanks.
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#2 (permalink) Old 05-27-2008, 08:15 PM
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only 2 things... your compressor is low on refrigerant oil and about to burn out on you... OR your magnetic clutch is beginning to fail
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#3 (permalink) Old 05-28-2008, 03:27 AM
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only 2 things? .....

Depends where you hear the noise, a hissing noise heard from inside the car is more likely it's low on refrigerant gas. When the gas passes the TX valve, it tends to make this noise when gas is low.

I don't think it would be the clutch fan as it's not entirely for A/C.

Outside the car in the engine bay is another story. If this is the case, get it check out, shouldn't be too hard to find, there isn't much to a/c system.
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#4 (permalink) Old 05-28-2008, 10:15 AM
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Quote:
Originally Posted by pepsicola View Post
only 2 things? .....

Depends where you hear the noise, a hissing noise heard from inside the car is more likely it's low on refrigerant gas. When the gas passes the TX valve, it tends to make this noise when gas is low.

I don't think it would be the clutch fan as it's not entirely for A/C.

Outside the car in the engine bay is another story. If this is the case, get it check out, shouldn't be too hard to find, there isn't much to a/c system.
:-) when gas is low, the compressor will be disabled- there is a safety pressure switch on the low side of every automotive A/C system, tht serves as a breaker when the system is low on gas or absent of freon.

i said magnetic clutch & not fan clutch :-).... the magnetic clutch on A/C compressors is the black pulley head where ur belt connects to ur A/C compressor. Note it's operation when ur A/c is on/off and you'll see what i mean ;-)
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#5 (permalink) Old 05-28-2008, 03:45 PM
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um, I did thought u were talking about fan clutch, lol, my bad.

However, a/c will not turn off unless it reach a very low level, it will still work say with 1/2 or even 1/3 of the pressure in the system, and that's when it will make that noise.
If you live in melbourne, you come to my work, I'll show you.
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