Air-con noise

uk_dave&gill · 26th July 2008, 17:34

This has suddenly started today

Basically when I start the engine (with air-con on) or start the air-con going once the engine is running, I get a "whine" for about two seconds then it disappears and the A/C works fine. It's literally a whine as I thought it was the dogs in the back to start with!

I have tested to see if it's each time I switch the A/C off and then back on, but it doesn't seem to be. Not yet tested if it's more heater related (ie if it does it when switching on to "Econ" mode)

Now I'll just sit back and wait for folks to tell me it will be something very expensive and/or unobtainable (it's been one of those weeks....)

sworks · 26th July 2008, 18:02

Sounds like it may be the txv valve in the heater box, quite common to make this noise ( fitted on the drivers side lower heater box - behind the trim next to your left leg). If really annoying it can be changed but you will need to 'reclaim' the gas and then refill.

T-Cut · 26th July 2008, 20:11

Yes, your refrigerant gas is low. Go to KwikFit and get it serviced under their 'colder or your money back' guarantee. But don't buy anything else!

TC

uk_dave&gill · 26th July 2008, 22:57

So perhaps not as bad as I thought?

Will I get colder cold air if I do this too?!??!

SD1too · 26th July 2008, 23:03

Dave,

Be sure that the drivebelt tension is o.k.
They make a 'shriek' under load when they're loose. Engaging and disengaging the compressor could trigger this.

Simon.

T-Cut · 27th July 2008, 00:43

Quote:

Originally Posted by uk_dave&gill

Will I get colder cold air if I do this too?!??!

KwikFit guaratee it, or your money back. What's to lose?

TC

Ken · 27th July 2008, 07:04

Quote:

Originally Posted by T-Cut

KwikFit guaratee it, or your money back. What's to lose?

TC

I had mine done a few weeks ago and you get a print out of temps. If its not lower you don't pay mine was 2 degrees colder so I had to pay

The machine takes an hour to go through the cycle so take a book

uk_dave&gill · 28th July 2008, 11:58

Quote:

Originally Posted by SD1too

Dave,

Be sure that the drivebelt tension is o.k.
They make a 'shriek' under load when they're loose. Engaging and disengaging the compressor could trigger this.

Simon.

I'm guessing it is something to do with this

- Didn't make the noise when I switched it on to "Econ" after start up
- Didn't do it this morning (weather was very damp/misty)

IIRC from slipping fan belts in the past, on damp days they didn't screech, on dry days they did!

So, looks like I need to tighten my belt!

26th July 2008, 17:34	#1
uk_dave&gill This is my second home .. Join Date: Feb 2007 Location: Town Posts: 4,166 Thanks: 1 Thanked 189 Times in 105 Posts	Air-con noise This has suddenly started today Basically when I start the engine (with air-con on) or start the air-con going once the engine is running, I get a "whine" for about two seconds then it disappears and the A/C works fine. It's literally a whine as I thought it was the dogs in the back to start with! I have tested to see if it's each time I switch the A/C off and then back on, but it doesn't seem to be. Not yet tested if it's more heater related (ie if it does it when switching on to "Econ" mode) Now I'll just sit back and wait for folks to tell me it will be something very expensive and/or unobtainable (it's been one of those weeks....)

26th July 2008, 23:03	#5
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,386 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Air con. whine Dave, Be sure that the drivebelt tension is o.k. They make a 'shriek' under load when they're loose. Engaging and disengaging the compressor could trigger this. Simon. __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

26th July 2008, 18:02	#2
sworks Been absent for a while… Rover 75 Tourer, Classic mini Cooper S, Abarth 595 competizione, MG TF and a Hyundai Tucson PHEV Join Date: Feb 2007 Location: Cumbria Posts: 13,065 Thanks: 1,033 Thanked 1,686 Times in 1,040 Posts	Sounds like it may be the txv valve in the heater box, quite common to make this noise ( fitted on the drivers side lower heater box - behind the trim next to your left leg). If really annoying it can be changed but you will need to 'reclaim' the gas and then refill.

26th July 2008, 20:11	#3
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	Yes, your refrigerant gas is low. Go to KwikFit and get it serviced under their 'colder or your money back' guarantee. But don't buy anything else! TC

26th July 2008, 22:57	#4
uk_dave&gill This is my second home .. Join Date: Feb 2007 Location: Town Posts: 4,166 Thanks: 1 Thanked 189 Times in 105 Posts	So perhaps not as bad as I thought? Will I get colder cold air if I do this too?!??!