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AC compresor pulley noise - Venture Chevrolet Cars & Trucks

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Some times the PVC valve line will have a leak ir crack in it which causes the positive ventilation control valve to chatter rapidly , this is easley mistaken as a idler or ac belt noise.

Posted on Oct 20, 2013

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Posted on Jan 02, 2017

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Loud clicking noise comes on when AC is turned on.


compresor engages and make the click sound

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2.0 Liter, 2003 Rav4. Car had a ticking noise, Toyota replaced serptine belt and still makes ticking noise. Toyota says its lower engine rod bearings. I used stethascope and noise seems to be coming from...


big end bearings( lower engine rod bearings to confuse) knock at idle and get louder with rpm
if the noise changes with rpm and you are hearing it near the ac compressor then it could be the ac pulley bearing
test if it is the compressor by listening and then turning the ac off the pulley will still spin but the compressor stops
if the noise remains , replace the pulley bearings

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My jag's a/c compresor froz up and now shop wast 1200.00 for change out and charge system. Is that all it will need jag X type 3.0


The AC is driven by a pulley pulled by the serpentine belt. When the AC is switched on an electrical clutch engages the driven pulley with the AC compressor on the same shaft. If the AC compressor is frozen up the pulley will not turn when the AC is switched on and the belt will squeal as it is pulled over the static pulley wheel. If, when the AC is switched on, the pulley wheel continues to spin then it is likely that the electrical clutch is not engaging. It is much more often the case that the clutch fails before the AC seizes. If this is the case check out the AC fuse and clutch relay. The fuse can be inspected visually and the relay can possibly be inter- changed with one that is similar (windscreen wiper or electric windows). The relay should make a 'click' that can be heard when the AC is switched on. Put the suspect relay into a circuit that you know is working in order to check it.

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Where is the pulley tension located


runs on altenator crtank ac compresor and idler pullys,located between crank and ac 14mm bolt on tensioner needs to be loosened and then 14mm ajuster bolt undertentioner (usuallyseized) IF FREED UP make sure goes back in strait

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2006 Chevy Cobalt cuts off if ac is running


this may be a compresor issue,when the car is normal(a/c off) the compressor is not draging the engine,how ever when on if the compressor is goin bad(seizing) will turn your engine off and the belt will drag. have you compressor checked and also see if the system is over charged.

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2003 lexus gs 300 makes loud grinding noises while air conditioning is running. The noise lessens when pushing on the gas, but gets louder when idling or in Park and Neutral gears.


One of three things. I would start with removing the belt and checking the idler and tensioner pulleys to see if they are running smoth. The third item would be the ac compresor brg.

Aug 26, 2009 | 2003 Lexus Gs 300

2 Answers

Grinding sound when running a mechanic said its timing chain..


First question. IS IT NOISY ONLY WHEN THE A/C IS ON ? If yes , its the compressor, if not could ne the A/C compressor clutch bearing. Best found using a " mechanics " stethoscope such as a doctor uses to pinpoint the noise. Hope this helps

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Did you check your ac pulley before installing the belt? check for some play on your ac pulley. your ac pulley bearing must have been worn out and needs replacement.

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