air conditioning whine

steando · 14th July 2009, 15:39

got an 03 75 2.0cdt.air conditioning makes a whine occasionally and is not too cold when stationary or travelling slowly.any ideas

2Diesels · 14th July 2009, 15:55

Well the first thing is to check the cooling fan cuts in on slow speed when aircon is switched on. Depoending on age it will have either a 3 speed which will require replacing or the later 2 speed in which case you might get away with just a new resistor I have just replaced my 3 speed fan using a Kenlowe from Jules as it is the cheaper & probably more reliable option

Regards Col

comanche · 14th July 2009, 16:41

Think the first thing you should check is your radiator fan, should be running at low speed with A/C on.

Dave***t · 14th July 2009, 17:12

Is it a constant whine that rises and falls with engine revs the whole time that the system is operating?

mantianak · 14th July 2009, 17:50

If it changes pitch with the engine revs and only when the air con is on then it's likely the air con and will need checking out - mine is whinning too.

T-Cut · 14th July 2009, 17:59

If the whine becomes a whoop, get a recharge.

TC

Gman2 · 14th July 2009, 20:38

Quote:

Originally Posted by Dave***t

Is it a constant whine that rises and falls with engine revs the whole time that the system is operating?

Had the same problem with the R75 and it's the compressor. The fan is unaffected with the engine revs. Got mine sorted with the Nationwide Auto Centre aircon overhaul with oil and freshner for £69. Whine now gone thankfully and nice and cool.

martin green · 15th July 2009, 10:41

WHAT about the compressor box, How long before that needs replacing? Mines 7 years old now and still doing the do, however i have noticed its getting a little rattley when i get out of the car with engine on. It does not seem to effect the ice cold effect, just sounds worn a bit, but can these go without warning?.

In regard to the fan, my fan has not worked since dec 2006 and i decided not to replace it to see if it made no difference. The difference has been zilch with my diesel.The other week in Scotland(on hols) the car was in 93F and the temp does not get off just under half on the needle, i can have it in traffic and on long motorway runs fully loaded(8 hours) no difference.

I'm begining to wonder if you need the fan on these diesels in first place and mine has now done 3 years with out one.The climate control still functions and its still deep freeze and the cooling of the engine is not been a problem.

The only question i have is the following, does all of this effect my diesel engine heater? opposite within the winter months, as I have noticed that comes on less now than when new,That still functions but less often, are all these things linked in a round about way~?

Jules · 16th July 2009, 00:08

The whining noise of some compressors can be cured by adding some more PAG oil during the re-gas.

If this makes no difference, chances are the compressor is worn, just like a tired engine can get.
Lack of cooling fan has been proven to shorten the life of AC compressors.

Some diesel owners reported to me that they "Boiled over" in traffic in the last heat wave.
My slightly biased advice is get your duff cooling fans changed !!

Is it worth the risk to your engine & compressor?
I'll leave that decision up to you

Dave***t · 16th July 2009, 06:28

Quote:

Originally Posted by Jules

My slightly biased advice is get your duff cooling fans changed !!

Is it worth the risk to your engine & compressor?
I'll leave that decision up to you

Yeah, that's why I asked about the nature of the OP's whining - mine was doing that, so I called in an air con specialist and he said it was making that noise because the compressor was having to work harder because the fan was on its way out.

Sure enough, sorting the fan out solved the problem - an expensive job, but cheaper than having a new compressor at the same time!

14th July 2009, 15:39	#1
steando Newbie rover 75 saloon Join Date: Jun 2009 Location: liverpool Posts: 14 Thanks: 0 Thanked 0 Times in 0 Posts	air conditioning whine got an 03 75 2.0cdt.air conditioning makes a whine occasionally and is not too cold when stationary or travelling slowly.any ideas

14th July 2009, 17:12	#4
Dave*t Gets stuck in MG ZT+ 180 SE** Join Date: Mar 2007 Location: Birmingham Posts: 646 Thanks: 0 Thanked 1 Time in 1 Post	Is it a constant whine that rises and falls with engine revs the whole time that the system is operating? __________________ [SIGPIC][/SIGPIC]

14th July 2009, 17:50	#5
mantianak I really should get out more....... ZT 190+ Saloon Join Date: Nov 2006 Location: Poole Posts: 2,413 Thanks: 6 Thanked 22 Times in 21 Posts	If it changes pitch with the engine revs and only when the air con is on then it's likely the air con and will need checking out - mine is whinning too. __________________ http://i35.photobucket.com/albums/d1..._signature.png

16th July 2009, 00:08	#9
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	The whining noise of some compressors can be cured by adding some more PAG oil during the re-gas. If this makes no difference, chances are the compressor is worn, just like a tired engine can get. Lack of cooling fan has been proven to shorten the life of AC compressors. Some diesel owners reported to me that they "Boiled over" in traffic in the last heat wave. My slightly biased advice is get your duff cooling fans changed !! Is it worth the risk to your engine & compressor? I'll leave that decision up to you __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

14th July 2009, 15:55	#2
2Diesels Trader ZT 260SE, Connoisseur CDT Join Date: Mar 2009 Location: The Ancient Shire Of Bedlington Posts: 12,597 Thanks: 68 Thanked 506 Times in 305 Posts	Well the first thing is to check the cooling fan cuts in on slow speed when aircon is switched on. Depoending on age it will have either a 3 speed which will require replacing or the later 2 speed in which case you might get away with just a new resistor I have just replaced my 3 speed fan using a Kenlowe from Jules as it is the cheaper & probably more reliable option Regards Col

14th July 2009, 16:41	#3
comanche Avid contributor Rover 75 Tourer 2.0 V6 Join Date: Apr 2007 Location: Mansfield , Notts Posts: 136 Thanks: 0 Thanked 6 Times in 1 Post	Think the first thing you should check is your radiator fan, should be running at low speed with A/C on.

14th July 2009, 17:59	#6
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	If the whine becomes a whoop, get a recharge. TC

15th July 2009, 10:41	#8
martin green Posted a thing or two ROVER 75 TOURER CDT 2002 & 2000 PRIMROSE YELLOW 75 SE Join Date: May 2007 Location: ASHBY DE LA ZOUCH Posts: 1,518 Thanks: 0 Thanked 1 Time in 1 Post	WHAT about the compressor box, How long before that needs replacing? Mines 7 years old now and still doing the do, however i have noticed its getting a little rattley when i get out of the car with engine on. It does not seem to effect the ice cold effect, just sounds worn a bit, but can these go without warning?. In regard to the fan, my fan has not worked since dec 2006 and i decided not to replace it to see if it made no difference. The difference has been zilch with my diesel.The other week in Scotland(on hols) the car was in 93F and the temp does not get off just under half on the needle, i can have it in traffic and on long motorway runs fully loaded(8 hours) no difference. I'm begining to wonder if you need the fan on these diesels in first place and mine has now done 3 years with out one.The climate control still functions and its still deep freeze and the cooling of the engine is not been a problem. The only question i have is the following, does all of this effect my diesel engine heater? opposite within the winter months, as I have noticed that comes on less now than when new,That still functions but less often, are all these things linked in a round about way~?