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Unread 10-23-2003, 11:35 AM   #1
pygocentrus
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Join Date: Aug 2003
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AC making noise

when i turn on the AC, it makes a funny noise,espcially if i close the vents. the fan is working too hard in my opinion. what can i do?

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[size=3][b][color=silver]98 GC limited 5.2 4x4[/b][/color][/size]

[color=darkgray]mods:[/color][color=gray] 3 chamber magnaflow[/color]

[color=darkgray]upcoming mods: [/color][color=gray] throttle body, intake, and headers, 3" lift, tires, and system [i](if I can save enough $)[/i][/color]
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Unread 10-28-2003, 10:59 AM   #2
pygocentrus
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anyone got a clue about this?
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[size=3][b][color=silver]98 GC limited 5.2 4x4[/b][/color][/size]

[color=darkgray]mods:[/color][color=gray] 3 chamber magnaflow[/color]

[color=darkgray]upcoming mods: [/color][color=gray] throttle body, intake, and headers, 3" lift, tires, and system [i](if I can save enough $)[/i][/color]
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Unread 10-28-2003, 11:01 AM   #3
ccyoder
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Quote:
Originally Posted by pygocentrus
anyone got a clue about this?
I haven't got a clue, but sometimes my A.C. sounds like its pulsating, like it runs faster, then slower, then faster again.
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Unread 10-28-2003, 11:52 AM   #4
Rooster77
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I have a 2000 GC limited that I got only a month ago, I had the dealer replace the AC compressor because it was noisy. The noise was easier heard in the cabin versus the engine compartment. Try listening carefully to the compressor itself, if you can get like a broom handle or something put one end on the compressor and the other to your ear it should magnify the "grinding" sound. When I first heard it in the cabin, I thought it was axle noise or something until I realized that it went away when I turned the A/C off. Now to make matters worse, just a week ago, listening carefully to the engine again and looking at the new compressor I realized that the compressor was always engaged and not cycling off and on like it should. A trip to the dealer and a $33 dollar cycle switch that is located on top of the receiver-drier had the compressor cycling off and on like it should. SO I am convinced that the defective AC cycle switch is what burnt out my previous compressor and had I not caught the problem I likely would of had to put another compressor in the thing in a year or so cause it was simply working the compressor way to hard likely burning the bearings right out of the thing. That was my experience anyway may be worth a quick check in your case!
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Unread 10-28-2003, 12:39 PM   #5
pygocentrus
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thanks for that rooster

so i should have my AC compressor checked. the thing is, when i turn on my AC, it gets louder as i turn it stronger and colder. also when i close the vents, it sounds nasty and loud.
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[size=3][b][color=silver]98 GC limited 5.2 4x4[/b][/color][/size]

[color=darkgray]mods:[/color][color=gray] 3 chamber magnaflow[/color]

[color=darkgray]upcoming mods: [/color][color=gray] throttle body, intake, and headers, 3" lift, tires, and system [i](if I can save enough $)[/i][/color]
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Unread 10-28-2003, 02:16 PM   #6
iroc22
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So it gets louder when you turn the fan setting higher?
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Unread 10-28-2003, 02:42 PM   #7
pygocentrus
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yeah

im thinking it has to do with the fan, thats what it sounds like
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[size=3][b][color=silver]98 GC limited 5.2 4x4[/b][/color][/size]

[color=darkgray]mods:[/color][color=gray] 3 chamber magnaflow[/color]

[color=darkgray]upcoming mods: [/color][color=gray] throttle body, intake, and headers, 3" lift, tires, and system [i](if I can save enough $)[/i][/color]
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Unread 10-28-2003, 04:45 PM   #8
iroc22
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Yeah sometimes electrical devices like motors will whine or make unusual noises before they are about to fail.
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Unread 10-28-2003, 05:13 PM   #9
pygocentrus
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i havent a slightest clue on what to fix
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[size=3][b][color=silver]98 GC limited 5.2 4x4[/b][/color][/size]

[color=darkgray]mods:[/color][color=gray] 3 chamber magnaflow[/color]

[color=darkgray]upcoming mods: [/color][color=gray] throttle body, intake, and headers, 3" lift, tires, and system [i](if I can save enough $)[/i][/color]
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Unread 10-29-2003, 01:21 AM   #10
iroc22
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Well check out your blower motor first anyway...
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Unread 08-16-2011, 06:05 PM   #11
jseligman02
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Quote:
Originally Posted by Rooster77 View Post
I have a 2000 GC limited that I got only a month ago, I had the dealer replace the AC compressor because it was noisy. The noise was easier heard in the cabin versus the engine compartment. Try listening carefully to the compressor itself, if you can get like a broom handle or something put one end on the compressor and the other to your ear it should magnify the "grinding" sound. When I first heard it in the cabin, I thought it was axle noise or something until I realized that it went away when I turned the A/C off. Now to make matters worse, just a week ago, listening carefully to the engine again and looking at the new compressor I realized that the compressor was always engaged and not cycling off and on like it should. A trip to the dealer and a $33 dollar cycle switch that is located on top of the receiver-drier had the compressor cycling off and on like it should. SO I am convinced that the defective AC cycle switch is what burnt out my previous compressor and had I not caught the problem I likely would of had to put another compressor in the thing in a year or so cause it was simply working the compressor way to hard likely burning the bearings right out of the thing. That was my experience anyway may be worth a quick check in your case!
Ive heard that switch referred to as the pressure switch also. Does that cause the a/c to cycle when it is on? Or I guess Im asking, when is the a/c suppose to cycle????
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