RX - 2nd Gen (2004-2009) Discussion topics related to the 2004 -2009 RX330, RX350 and RX400H models

RX350 07' - knocking noise when a/c turned on

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Old 07-18-17, 05:05 AM
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shlomie11
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Default RX350 07' - knocking noise when a/c turned on

The car:Lexus RX350 07', 190,000 KM, automatoc transmission
The problrm:Knocking noise when a/c turned on
I dont know what is the soutce of the noise, initialy i thought it came from the engine but drom closer inspection, it seems like it came from the belt tensioner or one of the pulleys. the sound starts only when the A/C turned on and stop when A/C turned off. i tried to see if ther is any plastic/metal movement but apperantly there isnt.
So, how can i find the problem? has anyone ever saw it before?
Old 07-18-17, 07:04 AM
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05RX330AWD
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If your compressor is making noise, there are 2 possibilities. Either the compressor is failing internally, or there may be insufficient refrigerant in the system to circulate the oil.
Old 07-18-17, 08:06 AM
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mdbrown
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Originally Posted by 05RX330AWD
If your compressor is making noise, there are 2 possibilities. Either the compressor is failing internally, or there may be insufficient refrigerant in the system to circulate the oil.
Or the compressor clutch is on it's way out.
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