Growling aircon

chris75 · 2nd August 2022, 16:24

I've been living with a growling noise (not the whooping noise ) when I activate auto mode on my aircon . I have recently realised that when I activate the demist function whilst in econ mode , I do not get the growling noise .
Does this mean I can eliminate the compressor as a possible source of the noise , as I believe the compressor runs when in demist mode ? I have always believed the noise to be coming from the heater unit under the dash , but have not yet felt like dismantling it to have a proper look

Perhaps it's time .........

dave lincs · 3rd August 2022, 08:55

If the Econ light is on air con is off, Is the cooling fan working when the air con is on?

SD1too · 3rd August 2022, 08:57

Quote:

Originally Posted by chris75

I have always believed the noise to be coming from the heater unit under the dash ...

Hmmm, an interesting question Chris. The demist function sets the airflow to the screen and a very high blower speed whereas 'Auto' mode is likely to direct the air mainly to feet and face level vents with a lower blower speed. What that means in practice I'm not sure.

The compressor always runs in demist mode and the majority of the time in Auto mode as well; certainly at this time of year it will!

I'd be interested to know if you find anything.

Simon

DMGRS · 3rd August 2022, 11:56

When was the last time it was serviced?
My ZT190 was a bit 'grumbly' when the charge in the A/C circuit was low - a service sorted it (the gas is removed and replaced in the correct quantity)

chris75 · 3rd August 2022, 15:21

Quote:

Originally Posted by dave lincs

If the Econ light is on air con is off, Is the cooling fan working when the air con is on?

Yes it is . Aircon is good apart from the growling

Quote:

Originally Posted by SD1too

The compressor always runs in demist mode and the majority of the time in Auto mode as well; certainly at this time of year it will!

Simon

So this is making me think that the compressor is not making the noise

I can't hear any such noise from the compressor when I have the bonnet up and listen in the engine bay

Quote:

Originally Posted by DMGRS

When was the last time it was serviced?
My ZT190 was a bit 'grumbly' when the charge in the A/C circuit was low - a service sorted it (the gas is removed and replaced in the correct quantity)

Serviced 9 months ago . Apart from the noise , aircon is very good

2nd August 2022, 16:24	#1
chris75 same car since 2005 2001 Rover 75 2.0 v6 Connoisseur Saloon Join Date: Nov 2006 Location: Ellesmere Port , Cheshire Posts: 3,811 Thanks: 379 Thanked 549 Times in 466 Posts	Growling aircon I've been living with a growling noise (not the whooping noise ) when I activate auto mode on my aircon . I have recently realised that when I activate the demist function whilst in econ mode , I do not get the growling noise . Does this mean I can eliminate the compressor as a possible source of the noise , as I believe the compressor runs when in demist mode ? I have always believed the noise to be coming from the heater unit under the dash , but have not yet felt like dismantling it to have a proper look Perhaps it's time ......... __________________ Who said it was simples ?

3rd August 2022, 11:56	#4
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	When was the last time it was serviced? My ZT190 was a bit 'grumbly' when the charge in the A/C circuit was low - a service sorted it (the gas is removed and replaced in the correct quantity) __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

3rd August 2022, 08:55	#2
dave lincs Posted a thing or two Rover 75 Saloon Join Date: Mar 2014 Location: Louth Posts: 1,409 Thanks: 380 Thanked 986 Times in 476 Posts	If the Econ light is on air con is off, Is the cooling fan working when the air con is on?