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  #1  
Old 07-18-2011, 09:56 PM
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Knocking/ticking noise from the A/C

After the car sits for a while (hour or two or more) I hear a knocking or ticking noise when the air conditioner is on. When I turn the A/C off, the sound goes away. After I drive for a while, the sound goes away. When the car was turned off I thought I heard a hissing sound from near the compressor. How many o-rings does this system have? I replaced one lat year. Maybe another is leaking and I am getting air pockets in the line? Suggestions on how to troubleshoot?
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
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Old 07-18-2011, 10:14 PM
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Re: Knocking/ticking noise from the A/C

Mine was recently leaking pretty substantially. I replaced the 4 o-rings common to the 2 main lines that connect to the compressor. There are 2 at the compressor, one on the firewall behind the snorkel, and one on the a/c condensor. You can just trace them from the compressor.
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'92 Ls-L Dark Teal
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  #3  
Old 07-18-2011, 10:18 PM
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Re: Knocking/ticking noise from the A/C

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Originally Posted by Cam View Post
Mine was recently leaking pretty substantially. I replaced the 4 o-rings common to the 2 main lines that connect to the compressor. There are 2 at the compressor, one on the firewall behind the snorkel, and one on the a/c condensor. You can just trace them from the compressor.
Did you notice any knocking or ticking noises coming from the car when you first started it up and the A/C engaged?
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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Old 07-18-2011, 10:22 PM
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Re: Knocking/ticking noise from the A/C

It would not engage, it was completely empty on r-134. Sorry.
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'92 Ls-L Dark Teal
11:1 CR ECUTUNE pistons
ECUTUNE .256 duration intake/exhaust cams
ECUTUNE STAGE 2AV1 ECU
Z32 MAF/SR20DET injectors
Balanced & Blueprinted
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  #5  
Old 07-20-2011, 11:32 AM
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Re: Knocking/ticking noise from the A/C

My mechanic thinks it may be the clutch on the compressor. It only happens after the car has been recently driven and has been sitting for an hour or so. It goes away pretty quickly once the car is started and I don't hear it if the car has been sitting overnight. He suggested letting it go for now and wait and see if it gets worse.
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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Old 07-20-2011, 11:42 AM
92snowmachine 92snowmachine is offline
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Re: Knocking/ticking noise from the A/C

if the noise is coming from the front of the compressor it could be the clutch, if it's coming from the back it could be the reed valves in the compressor. try using a long screwdriver to isolate the noise. another thing you can do to check the clutch is dump water on it when it's making the noise to see if it goes away or at least changes tone.
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Old 07-20-2011, 02:01 PM
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Re: Knocking/ticking noise from the A/C

The A/C is working and the compressor is not cycling, right?
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Old 07-20-2011, 04:33 PM
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Re: Knocking/ticking noise from the A/C

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Originally Posted by Earthworm View Post
The A/C is working and the compressor is not cycling, right?
Correct. The A/C is still nice and cold and stays on/cold and especially these days with how hot it has been.
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
1992 Red Ferrari 348 ts, 82,XXX, Redline everything
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