Aircon noise / regas cans

Gman2 · 20th June 2009, 06:54

I've got an audible whine as soon as I switch to aircon that immediately ceases when I switch to ECON. I've assumed previously on a post that it's the bearing in the compressor but could it be the fan causing the noise? The whine is on constantly with the aircon.

If it is the bearing then I know from posts that a regas with the lube has been known to sort. There has been mixed feelings with regard to the DIY cans but I've noticed the Halfruads kit has the oil. What I have noted that in the R75 Haynes manual they include the DIY cans as a "top tool tip"

Greeners · 20th June 2009, 07:00

spend £50 or £60 and get a local A/C specialist to have a look, if it's cold, then the gas is probably ok.

Anything in a can won't solve your problem.....

Livermpj · 20th June 2009, 07:49

I think the whine could be from the thermostatic valve inside the car. IIRC it oscillates back and forth to maintainan a constant temperature in the evaporator.

Mine started whining after a gas top-up (carefully done by a workmate who has pressure gauges, manifold & gas). Apparently the valve adopts a different working position as the pressure inside the system changes, and topping up causes an increase in pressure. After a while the valve beds-in, and quietens down (mine has anyway).

Right from new, there's always been a faint noise with aircon on, I think it's a "characteristic" of the car.
HTH, Pete.

chris75 · 20th June 2009, 16:54

Sorry if I'm stating the obvious , but if this is not a new noise then might it not just be the fan , working as intended ?

The fan is quite audible , and goes off with the econ setting..........

James.uk · 20th June 2009, 17:41

Personaly I prefer to leave air-con stuff to the experts, mine is booked in for Monday pm due to the belt beginning to screech when the air-con is turned on, I bought a 2nd hand Compressor for £75 (with 6 month warrentee) last week just in case ---

I know the aux belt is ok, it was replaced only 4 weeks ago..
.

Gman2 · 20th June 2009, 18:27

Quote:

Originally Posted by chris75

Sorry if I'm stating the obvious , but if this is not a new noise then might it not just be the fan , working as intended ?

The fan is quite audible , and goes off with the econ setting..........

Possible but it's on constantly when aircon is selected and the whine increases with the revs. With the ZTT the fan comes on but is discreet and intermittent

Gman2 · 28th June 2009, 07:52

Ok this annoying droning is the fan and not the aircon unit and is quite audible within the car. When I activate the aircon without the engine turning over it's silent. Engine on and aircon on then the fan kicks in and drones away but ceases when ECON is selected.
I get a tad confused with the fan set ups - the R75 is an 02 plate so I assume it's a 3 speed fan and that they stay on constantly with the aircon on? The ZTT is 04 and so will this be 2 speed and as said previously the fan is intermittent with aircon on and is hardly noticeable in the cabin.

So a noisy fan - any cures, is it a sign it's on the way out or do I live with it?

The aircon could also do with a regas but advice taken re a specialists.

20th June 2009, 06:54	#1
Gman2 Posted a thing or two ZTT+ 1.8T, mgf 1.8 Join Date: Sep 2007 Location: Warrington Posts: 1,550 Thanks: 28 Thanked 65 Times in 42 Posts	Aircon noise / regas cans I've got an audible whine as soon as I switch to aircon that immediately ceases when I switch to ECON. I've assumed previously on a post that it's the bearing in the compressor but could it be the fan causing the noise? The whine is on constantly with the aircon. If it is the bearing then I know from posts that a regas with the lube has been known to sort. There has been mixed feelings with regard to the DIY cans but I've noticed the Halfruads kit has the oil. What I have noted that in the R75 Haynes manual they include the DIY cans as a "top tool tip"

20th June 2009, 07:00	#2
Greeners Moderator MG-ZTT Join Date: Mar 2007 Location: Ware, Herts Posts: 19,798 Thanks: 161 Thanked 1,249 Times in 1,036 Posts	spend £50 or £60 and get a local A/C specialist to have a look, if it's cold, then the gas is probably ok. Anything in a can won't solve your problem..... __________________ *David* Impecunity is the mother of ingenuity Useful how to's for common problems Car Of The Month Jan 2014 [SatNav Power Down] [Coolant Level] [SatNav Repair] [Diesel Non Starting] [Paint Codes] [Rear Light Seals] [Reversing Light Switch] [Bleeding Brakes][Sunroof Drain] [Early ZT's][Instrument Pack Diagnostics][ATC Diagnostics]

20th June 2009, 16:54	#4
chris75 same car since 2005 2001 Rover 75 2.0 v6 Connoisseur Saloon Join Date: Nov 2006 Location: Ellesmere Port , Cheshire Posts: 3,818 Thanks: 379 Thanked 549 Times in 466 Posts	Sorry if I'm stating the obvious , but if this is not a new noise then might it not just be the fan , working as intended ? The fan is quite audible , and goes off with the econ setting.......... __________________ Who said it was simples ?

20th June 2009, 07:49	#3
Livermpj Loves to post Rover 75 CDT Club saloon Join Date: Nov 2006 Location: Nottingham Posts: 280 Thanks: 0 Thanked 3 Times in 2 Posts	I think the whine could be from the thermostatic valve inside the car. IIRC it oscillates back and forth to maintainan a constant temperature in the evaporator. Mine started whining after a gas top-up (carefully done by a workmate who has pressure gauges, manifold & gas). Apparently the valve adopts a different working position as the pressure inside the system changes, and topping up causes an increase in pressure. After a while the valve beds-in, and quietens down (mine has anyway). Right from new, there's always been a faint noise with aircon on, I think it's a "characteristic" of the car. HTH, Pete.

20th June 2009, 17:41	#5
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	Personaly I prefer to leave air-con stuff to the experts, mine is booked in for Monday pm due to the belt beginning to screech when the air-con is turned on, I bought a 2nd hand Compressor for £75 (with 6 month warrentee) last week just in case --- I know the aux belt is ok, it was replaced only 4 weeks ago.. .

28th June 2009, 07:52	#7
Gman2 Posted a thing or two ZTT+ 1.8T, mgf 1.8 Join Date: Sep 2007 Location: Warrington Posts: 1,550 Thanks: 28 Thanked 65 Times in 42 Posts	Ok this annoying droning is the fan and not the aircon unit and is quite audible within the car. When I activate the aircon without the engine turning over it's silent. Engine on and aircon on then the fan kicks in and drones away but ceases when ECON is selected. I get a tad confused with the fan set ups - the R75 is an 02 plate so I assume it's a 3 speed fan and that they stay on constantly with the aircon on? The ZTT is 04 and so will this be 2 speed and as said previously the fan is intermittent with aircon on and is hardly noticeable in the cabin. So a noisy fan - any cures, is it a sign it's on the way out or do I live with it? The aircon could also do with a regas but advice taken re a specialists.