aircon pulley noise

genpk · 13th November 2019, 07:32

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.

bl52krz · 13th November 2019, 09:21

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..

Wolfie · 13th November 2019, 16:01

Quote:

Originally Posted by bl52krz

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..

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.

SD1too · 13th November 2019, 19:20

Quote:

Originally Posted by genpk

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.

Peter,

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

genpk · 13th November 2019, 21:27

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?

bl52krz · 13th November 2019, 21:45

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.

SD1too · 13th November 2019, 21:47

Quote:

Originally Posted by genpk

its done about 40,000km since belts done.

But was the ancillary belt tensioner replaced then? That was my question.

Simon

rovertone · 13th November 2019, 21:50

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.

Arctic · 13th November 2019, 22:40

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

Coups · 17th November 2019, 16:31

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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13th November 2019, 07:32	#1
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,664 Thanks: 3 Thanked 461 Times in 299 Posts	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
bl52krz This is my second home Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008 Location: Birmingham Posts: 11,394 Thanks: 6,587 Thanked 2,262 Times in 1,729 Posts	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.. __________________ Great Barr, Birmingham.

13th November 2019, 21:45	#6
bl52krz This is my second home Rover 75 cdt club + Rover 2.5 KV6 Conni SE Join Date: May 2008 Location: Birmingham Posts: 11,394 Thanks: 6,587 Thanked 2,262 Times in 1,729 Posts	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. __________________ Great Barr, Birmingham.

13th November 2019, 21:50	#8
rovertone Gets stuck in Rover 75 Conne SE Auto CDTi Join Date: Nov 2012 Location: Redditch Posts: 670 Thanks: 185 Thanked 135 Times in 109 Posts	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. __________________ 2003 Mk 1 Connie SE CDTi Auto Monogram Mirage 2/Sandstone Leather 511th CDTi out of 4744 produced 9th in Mirage 2 out of 17 produced Also 2004 Rover 25 SXi CVT, 1999 Megane Cabriolet and still missing my 800 Fastback.

13th November 2019, 22:40	#9
Arctic Give to Learn Freelander 2 Join Date: Aug 2010 Location: West Midlands Posts: 18,717 Thanks: 1,155 Thanked 6,407 Times in 3,874 Posts	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 __________________ Arctic Givology Learn to Give Everything is Achievable ad altiora tendo. Check out our Nano meet dates http://www.midlandsnanomeets.co.uk/ http://www.the75andztclub.co.uk/index.php?thepage=howto " You do the work , we supply the expertise "

13th November 2019, 21:27	#5
genpk Posted a thing or two Rover 75 Saloon MGZT Join Date: Jul 2012 Location: Perth, AUSTRALIA Posts: 1,664 Thanks: 3 Thanked 461 Times in 299 Posts	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?

17th November 2019, 16:31	#10
Coups Posted a thing or two Rover 75 Contemporary SE Join Date: Apr 2014 Location: Dundee Posts: 1,941 Thanks: 545 Thanked 520 Times in 402 Posts	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. Sent from my SM-G935F using Tapatalk