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13th November 2019, 07:32 | #1 |
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Rover 75 Saloon MGZT Join Date: Jul 2012
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aircon pulley noise
Got an issue with a loud noise like a faulty pulley or similar when switching the aircon on.
Noise stops when i switch off the aircon. It almost sounds like its around near the belt tensioner area. Aircon is still functioning and the clutch on the aircon is still activating asper the switch (on and off) Cant remember if there are other pulleys on the aircon belt. |
13th November 2019, 09:21 | #2 |
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There is only the adjuster pulley and the pulley of the aircon pump. Probably the adjuster pulley is telling you that it’s time is up. Or the pump is trying to tell you it’s time is up. Easy enough to see from under the car, drivers side..
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13th November 2019, 16:01 | #3 |
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Aircon
Had similar problem with mine increasing the speed noise got louder decreasing noise got less. Fitted new pump also new condenser both looked very tired.Result very quiet now hope this is some help to you.
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13th November 2019, 19:20 | #4 | |
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Quote:
Always bear in mind that engaging the air conditioning compressor places a heavy load upon the engine so an increase in noise could be a lot of things, not solely the compressor. How many miles has your car covered since the ancillary belt tensioner was last replaced? Simon
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13th November 2019, 21:27 | #5 |
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its done about 40,000km since belts done.
When the aircon is off i can just here a pulley squeak even now and then but pretty quiet, as soon as i hit the aircon ,the pulley squeaking sound is quite loud and sounds like metal rubbing. Sprayed with hose and definately not idler pulley, somewhere up under engine bracket. Power steering pump seems fine as well. how hard is it to remove the tensioner pulley? |
13th November 2019, 21:45 | #6 |
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One fixed nut used for adjustment of the belt, and one to make it secure or to take it off to replace. Ten minute job.
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13th November 2019, 21:47 | #7 |
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But was the ancillary belt tensioner replaced then? That was my question.
Simon
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13th November 2019, 21:50 | #8 |
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I had this on my diesel and it turned out to be crankshaft pulley on its way out only showing up when load applied. So as others have said maybe look elsewhere.
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13th November 2019, 22:40 | #9 |
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OP as the car below so it will be different to the diesel engine.
Car Rover 75 Saloon MGZT Engine 2.5 Model Rover 75 , MGZT Model Year 2003
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17th November 2019, 16:31 | #10 |
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I had a noisy system. My mechanic suggested the compressor was on its way out. Turns out it only needed a regas. It still blew cold but the low pressure in the system was making the compressor work far harder than normal. Just a thought. When was it last regassed? Could be an idea to try an aircon specialist rather than a general mechanic or guesswork.
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